Generally when you have church parents and a kid who is not about that life, a kid that is anything but straight, a kid that is interested in anything even slightly niche, they're going to get looked down upon by their parents.

Just because it's a church doesn't mean the kid isn't called a bitch or whore, isn't told to be normal, isn't getting hit, isn't being actively disallowed to participate in anything, isn't being neglected...

Perhaps her father beats her with a belt. You certainly don't know that. And you can't say he doesn't because even if you were living there, a true abuser would find a way. (Burning girls with cigarettes where their bra strap would hide the scar...). There's a lot of evidence of church parents being very abusive towards their kids that don't fit in their pretty little mold. And you always hear, "I never thought [he'd] do that!"

It comes from home.

You gave her the ability to get out of there.

By God, report them to CPS, especially if she returns. Something is going on at home.