So today I was supposed to "hang out" with this chick, but It turned out that I had to cancel on her because I had something else that I needed to do.

Is there anything I can do to make sure that her interest doesn't die out?

I might still see her tomorrow or sunday afternoon and she said she's free so that might still happen.

Is there anything i should do to keep her interested or is it totally fine that I had to reschedule with her?

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Totally fine, might even work in your favour. Depends on how you play it, really, IMO. You have a life to live, doesn't revolve around this girl, right?

well yeah, i mean my busy life is the reason that i had to cancel in the first place haha

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make an attempt to meet more girls so that you actually don't care about this sort of thing

girls are easily replacable, and it's easier to do 30 new approaches and get some new dates, then to worry about if a girl will flake you, or if a girl from your last date showed up but she didn't enjoy the the night enough for it to end in sex

too much value on the girl you are trying to get with making you nervous and trying to not fuck it up is only going to limit you, just like having insecurities about why you are not good enough, both forms of anxieties will only kill your game

you are a guy, you are trying to get with a girl, girls like guys and like getting with them, even if specific girl A doesn't like specific guy B, guy B will still find plenty of girls that find him attractive, assuming he actually meets enough girls, and actually tries to get with them

insecurities, or caring too much, will prevent guy B from trying, because he either thinks there is no point because he is inadequete, or he thinks he will ruin it by trying and going too far, when it's more likely he will ruin it by not trying, if trying doesn't work, she is probably not interested and he is wasting his time anyways and could put that time into a more productive activity (such as meeting 30 different women and arranging dates that are not a waste of time)

just ask yourself, if the rolls were reversed, how would you act?, if this girl flaked you, would you now not like her?, if you liked her would you still want to see her?

the same can be used in almost every situation, if you are scared of XYZ, how would you feel if the girl in front of you did XYZ to you