What I've heard about her family situation:
Mother died a few years ago, father remarried
she was supposed to go to australia as an exchange student this or next year, her father let her live alone for a couple of months as practice for living abroad.
she has only attended school three days since april this year.
also, I've been told that a few years ago she got caught putting chemicals in her peers lunch/food. Since then she's been "on the radar", in counseling and so on.