She is either trying for your attention or you're not giving her what she needs. Sit down and talk to her. If that doesn't work you need to dump her no matter what. Because if you wait you're going to end up with your heart broken.
She either dosen't realize she's doing it(doubt it) or she really dosen't care and dosen't like you that much. So ask her to stop&tell her it hurts your feelings or something. If she continues to do so break up with her. (: