Why would a girl who has crush on me avoid me and ignore my friend request?

This girl showed every sign that she really really likes me (did not verbally confirm though).

I wasn’t “available” for two months, so I never made a move on this girl. I became available ten days ago, and tried to talk to her. She seemed frustrated and impatient at the end of the conversation and walked away before I had a chance to ask her out. I friended her on facebook a week ago, which she did nothing about.

I know sometimes a girl would move on if you don’t show interest fast. However, it feels like something else with this girl. She was actually still interested when talking to me ten days ago, her impatience started to become obvious during the conversation when I started to flirt with her for the first time ever. I can feel her frustration and impatience slowly building up during the past two months, but me showing interest was like a trigger for her to dump those emotions out.

So, was she 1) never interested, 2) already moved on that day, 3) punishing me for taking so long, 4) just looking for attention?

Thanks!

Why would a girl who has crush on me avoid me and ignore my friend request?
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