If you want to know the truth, she is probably either feeling lonely and wants some reassurance that someone wants her, or she is in the mist of a new relationship. Most likely she's in the mist of another relationship and want to know that she has you as a backup if something goes wrong. The best thing for you to do is ignore her. If she REALLY wants to be with you, she will TELL you. A missed phone call or text won't stop her from wanting to get back with you.