Maybe because she knew you hated her she wanted to prove she could still have sex with you.
I recall a maybe equally troubled girl once telling me a story "There was this guy that everyone said I couldn't get, and by the end of the night I was giving him a blow job."
My responce was "wtf?" did they give you a cookie?
I guess it opens up a new set of lines, have your friend go up to a girl you were talking to at a party saying "Sorry but you wouldn't have a chance with him." And see if that makes her take the bait..
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