What would have to happen to her to get her to give up those beliefs? Well, for starters, she'd have to dramatically change her opinion of her family.

I don't really buy this line of your argument. I disagree with my parents about quite a number of issues, religion and politics included. I also in retrospect disagree with some of their choices about how to bring me up (school choice etc.). At no point did I have to dramatically change my opinion of them. I didn't have to stop thinking they had my best interests at heart, or stop thinking they were intelligent and educated people. Part of the process of growing up and being exposed to the wider world is the realization that people disagree on all kinds of issues and that you can't rely on any single authority as a source of truth. People can be wrong without being liars, stupid or ill-informed (by comparison to the general population).