Camille Higgins is beautiful, popular, manipulative, and way out of Doug's league. She's just made a point of reminding him of that fact, after she breaks up with him after only using him for a free meal and a good grade. Girls like her are meant to use guys like him, and she's not afraid to tell him.
Doug's best friend, Danielle, doesn't appreciate what Camille did to somebody she cares about. So she's taken it upon herself to show Camille the error of her ways, and convince her that Doug's the kind of guy she should want to be around.