hello friend
I have been in the situation of girls "flaking" on me many times, so i started reading PUA materiale about what to do, and the best advice i found was to play it out cool, if a girl wrote a text and said that she couldnt see me anyway, i would wait one hour and write "okay" back and every time she wrote "dont be mad or something like that, so i started to experiment with it and the result was amazing, the longer i waited and the colder my response was the better she responded, so one time a girl flaked on me over a text and i waited 1,5 hour and answered with a simple "ok" and she instantly responded "im so so sorry, i have figured it out in the meantime, i can be at your house in 15 minutes if your not mad at me
" and i sat there completely stunned out of the response i got, and it have worked as a charm every time, just be careful not to be to hard on her the first time. but this flaking girl do is a shit test on you, to se how interested you are and how much she can control you. so back to your Q, if i was you i would wait and see if she contacts you tonight if she dosent, no big deal then its just time to move to the next level