What about letting her go bare below the waist around the house? That worked for my DS. When he was wearing something (even underwear) he would "forget" until it was too late. Being bare was a reminder to use the potty.

I also put the training potty in our main living area (on linoleum!) so he wouldn't have to go all the way to the bathroom to use it. He seemed more willing to interrupt his play if he could still see his toys, etc.