I feel that regardless questions you have asked the principal, they would be professionally answered... that will be the job of the principal... It is still important to visit the centre couple of times during operation hours (activity time, meal time, nap time, bathing time) and observe both children and teachers. Most important if the teachers can handle children well while ensuring they enjoy school time... Hope this helps... :)
One of the qn I would want to ask is .. if the principal is permanently stationed in that cc or that she is in charge of more than 1 cc. As this will affect the time she spent in a cc 2) curriculum ?
i would ask - what precaution is the center taking when there is a hfmd outbreak - What are the safety measures or precaution done in school for the children's - cctv? - daily activites?
i usually ask about the teachers background, safety, cleanliness, meals, timetable, bathing, and i always do a surprise visit.