Why don't you find out whatever guy she's closest to, and try and get the money from them. Like, if she has a boyfriend, demand he get it from her and give it to you, and if he doesn't, you can beat HIS ass?
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SmartMuffin - Because anything less would be uncivilized - http://img.imgcake.com/smartmuffin/barkleyjpgde.jpg
http://dudewheresmyfreedom.com/