Mommy: is she an only child? "Potty trained at home" VERY often means "We take her to the bathroom every 10 min, and when she goes (as is inevitable), we think that means she is trained". As we know, this doesn't work at daycare. I would not allow her to be in undies yet. If she is having one accident, once in a while, I could deal. I think maybe if she has an accident in the first couple hours of the day, then it's time to put a pull up back on, and talk to mom about readiness, etc.

You definitely have to treat it differently when a child is aware and CHOOSING not to learn, than you would if the child is blissfully unaware. Like the other poster mentioned, I think mom/dad need to put some thick undies on and take a day at home, ready to wipe up some puddles. They can then say, "Oh, see! Peepees!" or what have you.