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ELLEN WHITE WARNED THAT THE ORIGINAL FUNDAMENTAL PRINCIPLES OF THE SEVENTH-DAY ADVENTIST CHURCH (1872) WOULD BE ACCOUNTED AS ERROR - PROVING SHE NEVER BECAME A TRINITARIAN!
God showed Ellen White that wolves were entering the Seventh-day Adventist Church in her day 
and that the fundamental principles (1872) that had sustained the work of our pioneers, would
end up being accounted as error, and changed. She clearly supported the original fundamental principles, which reveals her belief as to who God is, and proves that she never
adopted the Trinity doctrine! Take a look at the quote from Sister White regarding this:
"The enemy of souls has sought to bring in the supposition that a great reformation was to take place among Seventh-day Adventists, and that this reformation would consist in giving up the doctrines which stand as the pillars of our faith, and engaging in a process of reorganization. Were this reformation to take place, what would result? -- The principles of truth that God in His wisdom has given to the remnant church would be discarded. Our religion would be changed. THE FUNDAMENTAL PRINCIPLES that have sustained the work for the last fifty years would be accounted as error. A new organization would be established. Books of a new order would be written. A system of intellectual philosophy would be introduced." (E.White, Testimonies for the Church Containing Messages of Warning and Instruction to Seventh-day Adventists, St. Helena, Cal., October, 1903. pgr.39)
Wow! What a warning! Now what did Sister White say would be 'accounted as error' and changed? THE FUNDAMENTAL PRINCIPLES of our pioneers. So let us take a look at the ORIGINAL fundamental principles of our pioneers concerning who God is:
The Fundamental Principles of Seventh-day Adventists - 1872 (source)
"1 - That there is one God, a personal, spiritual being, the creator of all things, omnipotent, om-niscient, and eternal, infinite in wisdom, holiness, justice, goodness, truth, and mercy; unchange-able, and everywhere present by his representa-tive, the Holy Spirit. Ps. 139:7."
"2 - That there is one Lord Jesus Christ, the Son of the Eternal Father, the one by whom God created all things, and by whom they do consist; that he took on him the nature of the seed of Abraham for the redemption of our fallen race; that he dwelt among men full of grace and truth, lived our example, died our sacrifice, was raised for our justification, ascended on high to be our only mediator in the sanctuary in Heaven, where, with his own blood he makes atonement for our sins; which atonement so far from being made on the cross, which was but the offering of the sacri-fice, is the very last portion of his work as priest, according to the example of the Levitical priest-hood, which foreshadowed and prefigured the min-istry of our Lord in Heaven. See Lev. 16; Heb. 8:4, 5; 9:6, 7; &c."
"16 - That the Spirit of God was promised to manifest itself in the church through certain gifts, enumerated especially in 1 Corinthians 12 and Ephesians 4; that these gifts are not designed to supersede, or take the place of, the Bible, which is sufficient to make us wise unto salva-tion, any more than the Bible can take the place of the Holy Spirit; that, in specifying the various channels of its operation, that Spirit has simply made provision for its own existence and presence with the people of God to the end of time ..."
Can you see what our pioneers believed regarding God? They clearly believed the truth that there is 'one God - the Father', just as the Bible teaches (John 17:3, 1 Corinthians 8:6, 1 Timothy 2:6) and that He is present everywhere by 'His representative - the Holy Spirit.' In other words - HIS Holy Spirit, which is why they call the Holy Spirit "IT" in belief number 16. They also clearly believed the truth that Jesus Christ is that 'one Lord' who is the 'SON OF the Eternal Father.' Again, just as the Bible clearly teaches (Romans 8:3, John 3:16-17, Matthew 3:17)
Now please understand this important point - Ellen White said that these 'Fundamental Principles' had "sustained the work for fifty years" prior to 1903, when she penned the warning above. So even in 1903 she still supported those fundamental principles concerning who God is and who Christ is. Which means, when we use her writings concerning who God is, we MUST interpret them in line with those original fundamental principles, which she supported and which 'sustained the work for the previous fifty years.'
And those fundamental principles regarding God were still the same in 1905! (source - see page 188)
"Messages of every order and kind have been urged upon Seventh-day Adventists, to take the place of the truth which, point by point, has been sought out by prayerful study, and testified to by the miracle-working power of the Lord. But the waymarks which have made us what we are, are to be preserved, and they will be preserved, as God has signified through His Word and the testimony of His Spirit. He calls upon us to hold firmly, with the grip of faith, to the fundamental principles that are based upon unquestionable authority." (E.White, Testimonies for the Church Containing Letters to Physicians and Ministers Instruction to Seventh-day Adventists, Ch.10, pgr.59)
"Let not erroneous theories receive countenance from the people who ought to be standing firm on the platform of eternal truth. God calls upon us to hold firmly to the fundamental principles that are based upon unquestionable authority." (E.White, Testimonies for the Church, Volume 8, p.298)
God calls us to "hold firmly, with the grip of faith, to the fundamental principles that are based upon unquestionable authority"! WOW!
This is so vital to understand, because many are using Ellen White's writings and are coming to a different interpretation than the original fundamental principles concerning God. And yet her belief concerning God could NOT be in contradiction to the original fundamental principles, even after 1900! Because she clearly stated that those fundamental principles were STILL SUSTAINING the work of Seventh-day Adventists in 1903 and remained the same in the Adventist Yearbook of 1905! Sadly, Sister White warned that those original principles would be accounted as error and changed. Now look what the current fundamental beliefs of the Seventh-day Adventist Church are today, regarding who God is.
Fundamental Beliefs of the Seventh-day Adventist Church - 2020 (source)
"1 - The Holy Scriptures - The Holy Scriptures, Old and New Testaments, are the written Word of God, given by divine inspiration. The inspired authors spoke and wrote as they were moved by the Holy Spirit ..."
"2 - THE TRINITY - There is one God: Father, Son, and Holy Spirit, a unity of three coeternal Persons. God is immortal, all-powerful, all-knowing, above all, and ever present. He is infinite and beyond human comprehension, yet known through His self-revelation. God, who is love, is forever worthy of worship, adoration, and service by the whole creation."
"3 - The Father - God the eternal Father is the Creator, Source, Sustainer, and Sovereign of all creation. He is just and holy, merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness. The qualities and powers exhibited in the Son and the Holy Spirit are also those of the Father."
"4 - The Son - God the eternal Son became incarnate in Jesus Christ. Through Him all things were created, the character of God is revealed, the salvation of humanity is accomplished, and the world is judged. Forever truly God, He became also truly human, Jesus the Christ. He was conceived of the Holy Spirit and born of the virgin Mary ..."
"5 - The Holy Spirit - God the eternal Spirit was active with the Father and the Son in Creation, incarnation, and redemption. He is as much a person as are the Father and the Son ..."
They don't even place God at the top! They DEMOTE God below the scriptures, whereas our pioneers rightly placed God at number one!
So as you can see, the beliefs regarding who God is, have COMPLETELY changed! The truth about the one true God, the Father, and His only begotten Son Jesus Christ, has been supplanted with this trinity god, which our pioneers rejected. The original 1872 fundamental principles of the Seventh-day Adventists have, just as Sister White warned, been "accounted as error." Even official Seventh-day Adventist publications have spoken about this change:
"Adventist beliefs have changed over the years under the impact of 'present truth.' Most startling is the teaching regarding Jesus Christ, our Saviour and Lord. Many of the pioneers, including James White, J.N. Andrews, Uriah Smith, and J.H. Waggoner, held to an Arian or semi-Arian view ... that is, the Son at some point in time before the Creation of our world was generated by the Father ... the Trinitarian understanding of God, now part of our fundamental beliefs, was not generally held by the early Adventists. Even today a few do not subscribe to it." (William G. Johnsson in the Adventist Review, Jan. 6, 1994 p.10)
"Most of the founders of Seventh-day Adventism would not be able to join the church today if they had to subscribe to the denomination's Fundamental Beliefs. More specifically, most would not be able to agree to belief number 2, which deals with the doctrine of the trinity." (George R. Knight- Ministry Magazine, October, 1993, p. 10)
"The Development of the Trinity doctrine demonstrates that sometimes doctrinal changes require the passing of a previous generation. For Seventh-day Adventists, it took over 50 years for the doctrine of the Trinity to become normative." (Burt, Merlin D. (2006) 'History of Seventh-day Adventist Views on the Trinity, 'Journal of the Adventist Theological Society': Vol. 17 : Iss. 1, Article 9. (P. 139)
And that is exactly what happened! ... "The next logical and inevitable step in the implementing of our unified fundamental beliefs, involved revision of certain standard works, so as to eliminate statements that taught, and thus perpetuated erroneous views on the Godhead. Such sentiments were now sharply at variance with the accepted fundamental beliefs set forth in the Church Manual." (LeRoy Froom, Movement of Destiny, p.422) - Please read our page - The DECEPTION that Changed the Seventh-day Adventist Church
So as you can see, the change took place after our pioneers died off and the NEW 'unified fundamental beliefs' were 'at variance' with the original principles. Even our historians confirm that the CHANGE took place and that our pioneers would NOT be able to join the current denomination if they had to subscribe to the current fundamental beliefs. This is truly shocking friends, and should cause every one of us to WAKE UP from our slumber and actually look into the TRUTH of this.
Now what do our leaders and preachers say today regarding Ellen White's belief about God? They say that yes, in her early days, she believed as our other pioneers. But then later, around the year 1900, she 'changed' her belief and became a trinitarian. Is this true? Did Ellen White CHANGE her belief? Well, let us ask Ellen White herself. But before we do that, just take note again of her warning at the top of this page. In 1903, yes, 1903! She said that the "fundamental principles" of Seventh-day Adventists, those penned in 1872, were STILL supported and had "sustained the work for the previous 50 years." And what did those fundamental principles teach regarding God? That there is "one God - THE FATHER ... who is everywhere present by HIS Spirit." And that there is "one Lord Jesus Christ .. the SON OF the Eternal Father."
So ALL of Ellen White's writings regarding who God is and who Christ is, MUST be interpreted in line with those original fundamental principles of 1872!