Gilbert Jorgensen has a truly amazing blog that deals primarily with Ellen White and her writings and teachings.
The main blog page is here. It's fairly new.
There are several important issues that have already been addressed - most notably a 20 part series on the 1844 issue. It should be read by all enquiring Adventists.
The Key to Understanding 1844 (only part 1 is linked.)
Also of note is that Ellen White supported the Millerite teaching regarding the return of Christ in 1843 AD. In fact, God confirmed this to her. The fact that 1843 came and went (and they moved the date to 1844, which came and went) shows that what she claimed was from God, was not from God.
Likewise with many of her teachings, visions, prophecies, etc.

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