Is it possible she is sporting a UTI ~ that usually results in increased urination and accidents in children? Has she been on antibiotics recently that could have knocked her natural flora down there out of whack making room for a UTI to take up route?

If she is doing ok during waking hours I would just ask for a pull up for nap time until she is accident free than ... my practice is during 'waking' hours they need to be accident free for two weeks before a containment unit can be removed and for 'nap time' they need to be waking up dry a month before I will forgo the containment unit then .... containment unit is either a pull up or rubber pant put on over top of the undies during waking hours and a pull up UNDER the undies during nap time and than when they wake it up I just remove the pull up and their undies are on already!

I also agree that having a clear 'potty training policy' for clients about the developmental markers you have to be seeing AT DAYCARE before you will start the process ... aka ability to dress / undress, ability to get onto potty independently, ability to communicate need to go and so forth ... otherwise you will constantly be dealing with battles of parents who want to toilet train when the child is clearly not READY ... as well as a policy of a 'containment unit', how many accidents per day you are willing to deal with before you 'take a break' and try again later and so forth cause these are all things that every parent will have a 'different idea' about and you need to decide what works for YOU and have them follow suit cause you have 5 children in care and cannot be engaged in 5 different practices!