We got off to a good start -- why is she suddenly avoiding me like the plague?

Anonymous
Before I say anything, let me just say that I'm a very pessimistic person at heart when it comes to these things. My friends have told me to stay optimistic, but believe me, I can tell when a girl is creeped out. =(

I'll try to keep this short, but some background info:

There's this girl in my class that I had a crush on. Have, I mean, because I still like her and would like to get to know her more. I received some interesting signs from her for the first two months of class, and so I eventually ended up asking her out to lunch before Spring Break. She agreed and what do you know, we had lunch together. All this time I thought it went okay, we got along well and all. I mean, she wouldn't have had lunch with me if she absolutely hated my guts, right? So Spring Break comes, but I'm forced to leave early due to bad weather and thus miss the class with her in it. I e-mail her asking if I can glance at her notes from class after break (and, of course, wish her a good break). I live five hours away from campus, so I didn't communicate with her all vacation, but I made that clear at lunch.

So break ends, and I do the usual: smile when I run into her, say "hi", glance in her direction every once in a while when we're in class. I don't come on too strong or anything. But last Monday, I saw her eating by herself and eventually got up the courage to go talk to her. We had some small talk, but she was very busy with schoolwork at the time so I said I'd let her be. Before I left, I asked her if she'd be interested in a second lunch sometime that week when she's not so busy (it had been a month since I asked her out for the first lunch). She said she's been under a lot of stress lately and has so much work that she has a hard time scheduling anything, but said she'd let me know by Wednesday when she's available.

Wednesday comes, and not a single word from her, not even a glance in my direction. Friday? Nothing. Saw her again today, and once again, didn't even look at me. In fact, every time class ends, she immediately bolts out of the room (usually she's the last person out of the class). We haven't spoken since, and she generally seems to be ignoring me to the best of her ability. Her friend gives me these scary-as-hell death-stares across the room, too, which doesn't make me feel any more positive.

So, I'm not sure what happened, but somewhere I screwed up and now she's avoiding me. And it looks like her friend wants to strangle me!

Is it possible I annoyed her by asking her out to lunch a second time? Did I creep her out by appearing too clingy? I honestly think I messed up somewhere and I should give up, but I don't know.

Thoughts? Any comments would be appreciated!

(PS: She is actually a very busy girl and is taking a lot of classes this semester, from what I understand.)
We got off to a good start -- why is she suddenly avoiding me like the plague?
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