The girl stalking me, will cut herself and or kill herself.
I really hate her. Like a lot. I would kill myself, just so I can be away from her.
Then let her down gently and offer to be her friend. If this keeps on, both of you are going to be miserable, and I'm sure she'd rather have your friendship than nothing at all. She probably isn't as bad as you think.
Believe me, I'm in a similar situation. I don't like the girl, but she REALLY likes me and I can tell, which is saying a lot because I am naturally oblivious. I'm not attracted to her in any way, but I'm still being her friend because she isn't all that bad. I've made it clear that my affections lie elsewhere, and her friends know that I am not interested. It's only a matter of time before the crush goes away.