Girl destroying my friends

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>Know this girl, thought she was odd so I tried being nice to her and be friendly.
>She'd never want to hang out with any of my friends or even me.
>Whatever just let her be and try to be nice.
>Whenever we'd have a party she'd never come but we'd invite just to be kind.
>Things between us were always odd, I'd say "hey" and she'd just say nothing and stare.
>She later files a complaint against me at college because "I make her uncomfortable."
>Go to a meeting, she isn't there we talk it out in 15 minutes. Everyone chuckles at the absurdity of the claims.
>Forget about her, she's insane.
>Weeks later I find out she's trying to date my one friend.
>She refuses to be polite to me, but she's trying to get into my social circle for that guy.

Forgive the blog. She has always been "cutesie" and talkative around him, but around anyone else, she's a total cold person. What should I do in this situation? My friend has this weird "Japanese Fetish" and is super blind to how two faced she is.