http://www.jesus-is-savior.com/False%20Religions/Seventh-Day%20Adventist/michael.htm
Read White’s rantings for yourself, as well.
To be fair, before it burned down, the SDA had a wicked good health food store, here.
But *everything* was vegetarian and they were closed on Saturday.
I would encourage you to read the books that I linked.
After reading them come back and tell me that Ellen White didn’t think Jesus was part of the Holy Trinity.
The Seventh-Day Adventist church believes and teaches there is a Holy Trinity and the Jesus Christ is God the Son.
As for references to him as an Angel, I’d need to read more than an isolated sentence to make a determination on what is being referenced in what context.