Potty Training

I've gone on leave for two weeks from work in order to work at getting our children potty trained (and to take a break from work). So far, things have gone quite well for Sean! Yesterday, he managed to wear a "big boy" underwear all day without soiling it. I've been using the Nintendo DS as an incentive to sitting on the potty, and so far that has been successful. Now we just need him to tell us that he needs to use it on his own!
On the other hand, Maia has shown little progress at all. She has little Cinderella panties, and I've tried to tell her that peeing on Cinderella isn't a good idea. Unfortunately, she still can't tell me when she needs to go and ends up wetting herself. Yesterday, I asked her if she needed to use the potty because I saw her grabbing at herself, and she said, "No." Like a fool, I said "Okay, tell me when you need to go," instead of forcing her to sit on the potty anyway. Not a minute later, she pees in the kitchen. So, it seems that she is not ready yet. She may be able to communicate to us better than Sean, but she isn't ready to use the potty.