Well, yes she did!
From Letter 32, 1899, quoted in the SDA Bible Commentary, Volume 5, pg. 1129 we have Ellen White stating:
"But although Christ's glory was for a time veiled and eclipsed by His assuming humanity, yet He did not cease to be God when He became man...The man Christ Jesus was not the Lord God Almighty, yet Christ and the Father are one."
The problem of course is that Jesus is the LORD God Almighty. Some SDA defenders have tried to assert that what she meant to say was that Jesus is not the Father, by inserting tropes (i.e. phrases or words) into the text of her statements. (Note: you can make any statement say what you want by using this method!) However, it would be easy to state that Jesus is not the Father! But that is not what she said.
But these are the kind of statements that Ellen G. White made all of the time. She was particularly "gifted" at making conflicting and contradicting statements. To say that "Jesus is not the Lord God Almighty " and then to say that "Christ and the Father are one" is conflicting and contradictory.
Now let us look at what Scripture says about Jesus Christ:
7 Behold, he is coming with the clouds, and every eye will see him, even those who pierced him, and all tribes of the earth will wail on account of him. Even so. Amen.
8 “I am the Alpha and the Omega,” says the Lord God, “who is and who was and who is to come, the Almighty.” (Rev.1:7,8 ESV)
It is very clear, from the above text that Jesus is the Lord God...the Almighty. False prophets have no qualms about contradicting Scripture. The one who contradicts Scripture is not of God. (1 John 4:1-6 Read this passage carefully!)
3 Therefore I want you to understand that no one speaking in the Spirit of God ever says “Jesus is accursed!” and no one can say “Jesus is Lord (Jehovah--LORD God)” except in the Holy Spirit. (1Cor.12:3)
9 because, if you confess with your mouth that Jesus is Lord (Jehovah--LORD God) and believe in your heart o that God raised him from the dead, you will be saved. (Rom.10:9)
In Isaiah 45:23b
The LORD (Jehovah) says:
‘To me every knee shall bow,
every tongue shall swear allegiance.'
and in Philippians 2:10,11 Paul says:
Therefore God has highly exalted him and bestowed on him a the name that is above every name, so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
It becomes obvious from the above passages that Jesus is Jehovah, and the Lord, the Lord God, and the Lord God Almighty.
From her writings in Desire of the Ages, she says:
"The words of the angel, 'I am Gabriel, that stand in the presence of God', show that he holds a position of high honor in the heavenly courts. When he came with a message to Daniel, he said, 'There is none that holdeth with me in these things, but Michael (Christ) your prince'." (Dan. 10:21) (THE DESIRE OF AGES, p99.)
And from her writings in Spiritual Gifts. she says:
"Michael, or Christ, with the angels that buried Moses, came down from Heaven, after he had remained in the grave a short time, and resurrected him, and took him to Heaven."
"As Christ and his angels drew nigh, Satan resisted their approach, but was compelled, by the glory and power of Christ and his angels to fall back. Satan claimed the body of Moses, because of his one transgression; but Christ meekly referred him to his Father, saying, "The Lord rebuke thee." " (SPIRITUAL GIFTS, Vol 4, Pg. 58)
these quotes it becomes increasingly clear that Ellen G. White believed
that Jesus was really the angel Michael. From the last quote, it
appears that she is also confirming again that she does not believe that
Jesus is the Lord, by saying, "Christ meekly referred him to his Father, saying, "The Lord rebuke thee." She does not see Christ as the Lord. She sees the Father as Lord, but not Jesus!
it may be hard to know exactly what was in the mind of Ellen G. White
when making these statements, she is making a good case for herself that
she did not believe that Jesus was the Lord God. To not believe that
Jesus is the Lord God, is to have faith that is void and in vain, and
ultimately to be damned. Jesus said that, "Unless you believe that I AM, you will die in your sins" (Jn.8:24). To not
believe that Jesus is the Lord God is to not have a mediator who is
both "God and man", which is what sinners need. If Jesus is not both of
these, there cannot be any reconciliation between God and man. Do you really want to follow a prophet who teaches such things?