Make sure she knows how many children pee in the ball pit each day, to check the whole place out for sweets/food left by children which hers may pick up and eat, that most of them will have nits by the time they get home, that the food is deep fried, that they are likely to have at least one confrontation with another child, several bruises and a high dosage of fruit shoot by the time they leave. But, they will have fun and after all, they are children!