This apparently made the news out there, and the girl that is filming has taken a decidedly different approach than her comments in the video show. She says she was solely taping and didn't know the black guy, yet in her video you hear her egging him on and call him by name. Also, she "didn't steal the bag, she was just holding it for the police."
I couldn't find the news clip, but she posted another video on youtube responding to "internet accusations" in which she essentially did the same thing as she did in the interview.
http://www.youtube.com/watch?v=CbsX5j-8T3Y