Careful, she and I discussed the "cure". When she returned, "fully human", she no longer speaks to me and is no longer available as a follower. I was truly saddened. So much I went and married Lydia. My first love.

I had this happen. I cured her right after the MQ, and she was busted... I went back, reloaded and kept her as a vamp for a while and she was good. After a while i cured her again, and she is fine...
I would try reloading an old save - ya never know!