Policies are there to help secure the viability of the daycare. People can't do as they please or it'll run the business into the ground. I agree, the manager needs to enforce the policy. Maybe she can take your colleague aside and meet with her concerning the situation. (Hopefully the daycare has a private office to facilitate this.) If needs be, the manager may have to explain the reasons for the fee and why it's important for the continued running of the daycare.