Why do girls ignore guys after a first date?

Anonymous
First date was 2 weeks ago, she ignored the few texts I sent her, until last week, where she sent a fb message stating that her cousins were in town and becuase of that meeting would be difficult. Waited a few days, and asked if she was free this weekend, which I got no reply to, and now she posts through fb that she will be going on a 3 week vacation. I even asked a mutual friend to try and contact her, but even she got no answer. What am I to do now? my guess is to put her on the afterburner and not contact her until a few months have passed.
Why do girls ignore guys after a first date?
4 Opinion