#6: Be held legally responsible for her actions, as an adult.
Guess what, Sparkydoodles? THAT is going to happen whether you, or her mother, or she herself likes it or not. Her mother needs to be preparing her to deal with that. Prepared or not, adult accountability is going to smack her in the face.
Did you happen to grasp that she is a 15 yr old coming back from Disney. Maybe you can give her a break since she won't be 18 for 3 more years. God forbid if she is an adult and requests a hot meal on a plane. The horror....