keeps clothes and furniture from getting wet, but they feel the complete feeling of peeing on themselves. diapers and pullups wick away the moisture almost instantly so its not uncomfortable. there is no incentive for training.
it worked with both my daughters and ive used it at my preschool for years.
you'll need to start it with her like on a fri after daycare and do it really heavily over the weekend. you'll need to talk to your provider also about it. send her with several changes of clothing (bottoms) and 3 or 4 pairs of panties and the plastic covers.
its thee fastest way to potty train.
incentives work well too. i made up a sticker book and when she got a certain number of stickers we'd go get icecream or something.