She said "I'll let you know"?

So I finally grew some balls and ask this girl out today (cut me a break if I did something wrong, as this was the first girl I've ever formally ask out). I asked her what she was doing tomorrow night, and she said she didn't know, so I told her that I wanted to go out to dinner with her. She smiled and replied with, "I'll let you know". Then I ended with saying "text me". The convo was sort of abrupt as she was getting in her car and had to be somewhere. That was this morning, and she hasn't text me. She said she was busy today and tonight so if that's the reason why she hasn't then it's understandable, but I don't know if she maybe forgot as well? We've been texting back and forth for a couple days and she's shown vague signs of interest. Should I text her to sort of "remind" her that I asked her out this morning and kind of re-ask her? Or should I just leave it alone and see what happens and then if she doesn't text back pass it off as her not being interested?