Anecdotal, hearsay.
I base my understanding of what Ellen White & the other SDA's believed at that time from the official statements in their publications - if they changed their position on the Trinity or the "personality" of the Holy Spirit they would have put these 'new positions' in the same publications to counteract what they had said before. That's not what we see however - we see 'little ( anecdotal & hearsay ) stories' - mostly produced well after the death of Ellen.