I'm at a loss also. If your father absolutely refuse to let her go, and she needs to consent for being underage, then maybe try a site like this one? If she can't get private counseling sessions but she openly says she needs someone to open up to, maybe talk to the school? That's what school counselors are there for. And if she doesn't feel comfortable with that then maybe joining a psych. help site like this one for support would help her?