Request #594 From Carley

I have spent YEARS trying to remember this book. Our teacher read it to us in 4th grade (surprisingly at my catholic school). The premise follows a girl in high school, I believe her mother died and she was trying to cope with it. She throws a party at her house and her drink was drugged and she has to fight a man who happens to be stalking her? It sounds like a book I would read now.