Why has she stopped calling / texting me all of a sudden ?

I had been dating this girl i really like for about 2 months . But since she was gonna leave town for a couple of months , she decided to call off our relationship as she didn't wanna be in a long distance one . Anyhow ... its been a month now and we have been texting / talking to each other everyday . she keeps telling me how much she misses me each n every day . But all of a sudden now she has stopped calling or texting me . she'll reply to my texts , and answer my calls .. we'll talk for a while and then she says tht she'd call bak l8r .. but never does . Its more like a one way thing now.. she never initiates a conversation anymore and its pissing off cause i really feel a lot for her .Its been 2 days since she hasn called or texted . what is up with her ?.. What should i do ??