For sure limit the child to just one accident per day. After that she gets a pullup and her new outfit of clothes. Parents need to see that this is a daily thing.

If it becomes chronic then just put her in a pullup when she comes if mom doesn't. It is very common to get too busy to go to the bathroom in time and more to the truth unwilling to leave lest someone else take their activity or they miss out on something - both issues that do not exist at home.