Well to me, her attitude does not seem that fishy. At first she rejected him because she thought that he was after her body and had no consideration for her feelings( though she was wrong to judge him like that as he is about about to die, but she was kind of right from her PoV.). But as the series progressed and she saw his good sides, her faith in her was restored. So it is not that fishy. The "No class, no ass" moment seemed more to me as a mob psychology moment.