I have one i read a long time ago that ive been dying to remember. It was a YA i think; and it was about a young troubled lady who got sent off to an all girls college i believe? To help sort her out. There she meets this preppy rich girl and a girl whose very unemotional, offputting and just very guarded. They become a best friend trio and soon stuff starts to go awry. I think the preppy girl buys them all a house to live in? Main character thinks sad girl is up to no good but it turns out its preppy girl who is absolutely insane and ended up like.. cutting off locks of main characters hair and preforming spells to fuck her life up.
Lost Classics of Teen Lit: Name That Book! 