Appalachian Private School With a witchy vibe from mid to late 2000’s/very early 2010’s

I can remember only the vaguest details but a poor girl in Appalachia (I think WV) goes to a nice school with secrets and a witchy vibe. There’s something about her meeting up with a local boy from “the other side of the tracks” who stays in a room above the convenience store. And one of the teachers conducts secret rituals at night. And I think one of her friends ends up being pregnant or something. I’ve been trying to remember the book for years and I’ve never been able to find it.