So I had a pretty good date with a girl a couple weeks ago. We were supposed to hang out early this week for a second date and I txt her on the day we are supposed to hang out and she tells me that she can't make it because friends are in town..blah blah. Kind of sounds like a blow off flake move and it was about a half a days notice on the cancel. I kind of just let it go and figured NEXT. Now a couple days later she emails me and asks if I'm mad.

What do you think is the right move? Wait a day before responding? I'm not mad but I kind of feel blown off or disrespected like I'm some sort of back up. I actually kind of like this girl so if there could be a future I gotta nip this disrespect shit in the bud so to speak. Am I overreacting?

EDIT Additional Info: I still haven't replied. Even though I seemed to have really liked this girl I just feel it was disrespect to flake fairly last minute and likely it was BS. I'm torn between just not responding and moving on or giving her a chance. I just HATE flake behavior. I guess the fact that it's even bothering me and I'm considering giving her a chance shows that I thought there was real potential with her (I date TONS of girls usually don't give a shit.)

UPDATE