Drama Drama Drama!!! What should I do?

All right here's the short version. My ex-friend is haring me. Sending me IMs saying things like: "my best friend died now i feel like dying but no one cares so why shouldnt i" "read the obituaries i may in it and will have ur wish" oh and my fav. "what do you mean by that, that i get my wish and die if so u can go f@*k ur self b*@ch i wish the same upon ur fat @ss!" she even went to the extreme of posting this on my myspace comments,which was no accident she knew what she was doing. I havent even talked to her in like 8 months let alone im her. I don't want to talk to her after the sh!t she pulled on my birthday. What should I do??