I do want to wish you luck. I'm sure none of my advice is even in your control right now anyway. I guess just try to find a way to connect with her in her world. She'll feel like you are trying to understand her and it will encourage trust. Then she may become more receptive to what's outside her world. Maybe y'all can find a common ground, and maybe try something fun like a movie night? Bake some cookies? Visit a music store so she can sample other instruments? She won't become a different person in 2 weeks but a break from the norm might do her some good. I do highly recommend her parents remove her from school though. I've homeschooled for a decade and I'm quite passionate about it, now more than ever after seeing the horrible brainwashing that's come out the last few years.