Do you know that one Ex-girlfriend...

[SmartIdiot]

Get all of your friends and whomever else wants to be a part of it, and corner her at school for an intervention. You need to be the one leading it since you've been wronged, just flat out say, "Look, you're a whore, no one here likes you, GTFO." Either that, or take her out to the middle of a lake, and beat her senselessly with a wiffle ball bat.

This man speaks the truth.

A brilliant man indeed.

Certainly, however the wiffle ball bat method is a little time consuming. A drastic measure it would have to be.