I'm forced to agree with the others on this board. This girl is most likely messed up in the head, and will always find her way into an abusive relationship. We all know the type, and there really is no changing them.
However, i still think you have a shot at her. This girl doesn't want some office dork nagging at her for a date. We have to appeal to her darker side. Ever see the Seinfield episode where George pretends to be the "bad guy", and drives his father's car around. Classic... Go to the strip club and get a Polaroid with one of the dancers. Then go to walmart and get a frame to put it in. Put that bad boy on your desk at work, and you will have the respect of all your coworkers and your lady friend.