Well - you can't really know at this point of time exactly what is going on, but you CAN scotch your chances with her by appearing too needy or TOO into her. So I suggest no more calls or texts to her until SHE contacts YOU.

Maybe her old boyfriend showed up back in town, maybe she decided she wasn't that into you, maybe she had a death in the family and has been out of town, maybe you were too enthusiastic and she felt the need to back off, who knows? Just don't ASSume anything, and go on about your business. If she's into you, she'll get back in touch. If she's not - you don't want her anyway.