<human>: Can you provide a brief overview of the text?

I have been hanging out with a girl who lives in my aparment complex and I decided to ask her out. I had previously asked her if she wanted to go with my group of friends as a last minute friend type thing, but she was busy with her parents in town once and too busy the other time. Both times she asked if I could reschedule, but I never got around to it. 

I have really enjoyed spending time with her and wanted to ask her out on a more formal date. I called her and she did not respond, so naturally I waited. She called back after an hour or two and I asked her if she wanted to go to the zoo over my universities spring recess. She said she would have, but she would be out of town. I got kind of sad and whatnot so I stumbled through saying something along the lines of "well, ok, well maybe we can do something another time" and hung up the phone. I didn't really give her a chance to say anything else.

I was wondering if I should ask her out again and when or if I should let her be. Also of note is that I am currently really stressed out under the amount of work that I have and my stress certainly impacted my delivery of asking her out.
<bot>: How long after asking a girl out should I wait to ask her out again if she says she is going out of town?