Girl at school won't leave me alone! I don't want to be her friend!

Theres a girl at my school. She's very weird. She sent me a friend request on Facebook and I accepted. She started texting me and a day of us talking I knew I didn't want to be her friend. Maybe it's mean, but I don't have to be everyone's friend. She kept texting me and I told her kindly that I'm going through stuff (which is true. Boyfriend was in a horrible car accident) and didn't really have time to talk. She started texting me more and more and it went from kind to angry. Saying I'm a selfish bitch and a whore. She stalks me at schook and tried to talk to me at my locker saying asking why im only friends with wet backs and n*g*ers. I told her to oeave me alpne and she wont. I block her, she .akes a new Facebook. Then someone wrote whore on my locker Friday and I know who. Im scared to go back to school tomorrow...