A.D.
Go back and ask for cash instead of check? No I would not do that. You're asking to majorly inconvenience that family to ask that they go out to an ATM and then somehow make the change to figure your DD's exact payment in cash. Sure it would be easier for your DD if they had planned ahead to have the right amount of cash on hand. But if not, I would just go down to the bank, and cash the check for her. You can sign it "parent of minor" and your bank should give you the cash, no problem. Your DD doesn't have to have an account. Give the family a break and make it easy for them to want to call your DD to sit for them again.