Met online, got # a day later and went on a date the day after that. Lots of IOI and K-close pretty easily. Nothing out of the ordinary. Couldn't go for more due to previous plans with friends that evening but we had a tentative agreement to go out again the next day (pending work and stuff).

That fell through though with her saying she has to run some errands with her sister that day and I responded with "Mk, Ima go out with some friends then. Lemme know if you wanna get kidnapped some other time" (kidnapping being an inside joke, obviously referring to rescheduling date). Her response: "Sure I will Have fun".

It seems unlikely to me that this is a flake or buyer's remorse, but I guess an outside opinion won't hurt. My thoughts were to just wait a few days and if she hasn't tried to reschedule by then contact her again. A few days being 2-3.

Questions:
1) Is there a NEED to wait 2-3 days (or more?), a lot of the general public "knowledge" about this is not always true so I wanna get a more reliable opinion on it.
2) If/when contacting her, I generally keep is casual/funny and just act like myself while getting to the point. I don't like using canned lines, but if there's any specific advice on this as well I'm open to hearing it.

Thanks.

PS: By first date going "well" i mean it lasted 5 hours, with constant IOIs (hand crassness, hair, kino compliance), a bit of kissing or making out and good rapport. It wasn't mind blowingly amazing but still.