ANY proof that Ellen White was a Prophetess of the Lord?

I believe that Ellen G. White, the prophetess of most Seventh-day Adventists, received many true revelations through God-given dreams and visions but I have to qualify that. I believe that God sometimes tests individuals through imperfect revelations (Genesis 22:1-12). Consequently, I don't fault anyone for reporting and believing in their visionary experiences. Ultimately, I believe that all purported revelations must be tested, as per 1 Thessalonians 5:19-22.

Here is an example of what I consider to be a testable revelation from God to Ellen G. White that is supported elsewhere by undeniable proofs of a most grievous apostasy of the Seventh-day Adventist church:

One who sees beneath the surface, who reads the hearts of all men, says of those who have had great light: "They are not afflicted and astonished because of their moral and spiritual condition." "Yea, they have chosen their own ways, and their soul delighteth in their abominations. I also will choose their delusions, and will bring their fears upon them; because when I called, none did answer; when I spake, they did not hear: but they did evil before Mine eyes, and chose that in which I delighted not." "God shall send them strong delusion, that they should believe a lie," "because they received not the love of the truth, that they might be saved," "but had pleasure in unrighteousness." Isaiah 66:3, 4; 2 Thessalonians 2:11, 10, 12. {8T 249.2}

The heavenly Teacher inquired: "What stronger delusion can beguile the mind than the pretense that you are building on the right foundation and that God accepts your works, when in reality you are working out many things according to worldly policy and are sinning against Jehovah? Oh, it is a great deception, a fascinating delusion, that takes possession of minds when men who have once known the truth, mistake the form of godliness for the spirit and power thereof; when they suppose that they are rich and increased with goods and in need of nothing, while in reality they are in need of everything." {8T 249.3}

God has not changed toward His faithful servants who are keeping their garments spotless. But many are crying, "Peace and safety," while sudden destruction is coming upon them. Unless there is thorough repentance, unless men humble their hearts by confession and receive the truth as it is in Jesus, they will never enter heaven. When purification shall take place in our ranks, we shall no longer rest at ease, boasting of being rich and increased with goods, in need of nothing. {8T 250.1}

Who can truthfully say: "Our gold is tried in the fire; our garments are unspotted by the world"? I saw our Instructor pointing to the garments of so-called righteousness. Stripping them off, He laid bare the defilement beneath. Then He said to me: "Can you not see how they have pretentiously covered up their defilement and rottenness of character? 'How is the faithful city become an harlot!' My Father's house is made a house of merchandise, a place whence the divine presence and glory have departed! For this cause there is weakness, and strength is lacking." {8T 250.2}