What do YOU want? If you like her, then talk to her... in person, not via text message or email. If you don't like her, move on. Many people have different patterns of behavior... she might just be unable to manage her time well, she might have met somebody else, there is no way to know unless you ask her. But it kinda sounds to me like she is not interested, but is too childish to tell you directly... unfortunalty the childish types are sometimes also the carefree happy go lucky types that attract so many of us...