Simply make an entertaining video, top it off with "and if you're my daughter, stop scrolling and empty the dishwasher" and wait.

If day == Tuesday, print "Please put out the bins"

If day == Saturday, print "Be home by 9pm"

Tiktok targeting is not very good, best bet would be finding out what hashtag to target.

Probably easier just to decompile tiktok and insert some code which checks for a video at a certain known location controlled by you and plays it if it is present. And then surreptitiously install that app on her phone.