How long?

Four days. We were supposed to go out last Saturday.

chill out dude, it's only been 4 days and it's still the middle of the week. She said 'definitely', not 'maybe some other time'.Plus she intentionally gave you her number. Sounds like she does want to go out, just give it a bit of time. If she blows you off a second time then maybe you should forget about it. Just send her a text asking when would be good for her or something

I already texted...you don't want to double text. I;ll let her come to me.

Alt? If so, good. You're still in a good spot, she hasn't really blown you off yet. Just be patient