Thanks DNCall for sharing this story. I'm glad it had a happy ending for your sister despite the challenges she endured her last years of high school.
Hopefully your sister's experience can be encouraging to others enduring a similar situation.
The bad news is that for minors whose parents join the religion when they are younger, the time until their emancipation, liberation and freedom can be too long--especially for those that are born in to the religion and know nothing else.