Without further information about you and your situation, it's really hard to tell you anything else than that she is the only one who could provide explanations for her decision, if she wanted to.
A few scenarios come to mind, though.
As ns123 added, and especially if you are both very young, she may not be the one responsible for this decision - I'm thinking of an overprotective father who would have recently discovered the relationship and forbid it.
Also, she could have considered your whole involvment to be casual, and not an actual relationship. When she found she wasn't having fun anymore, she called it off. There are nicer ways of doing that, but this is the easiest and, well, most widespread.
And to be honest, her message ("get out of my life") and refusal to answer her phone makes me think of a stalker situation - you can't get rid of insisting unwanted attention by talking it over, you can only try to cut it out of your life. Is it possible that the 2 of you had a very different idea of what happened during those last 4 months? Again, without further information we can only speculate.
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