Yup, exact same problem going on here. DD "sucks it back in" as she describes it during the day, and waits for a pullup. It is so frustrating! I have had some people recommend fiber chews to me recently, so I'm going to try them.
DH had some success this past weekend bribing her with chocolate treats. I'm not thrilled with this method, but the whole thing is so unpleasant I figured what the heck, at least DH is dealing with it!
I also refuse to clean poopy underwear, it gets pitched immediately. Then she has to wear a diaper b/c big girls who poop in the potty wear underwear, babies who poop in their pants wear diapers. Not a punishment, but very matter of fact. This is more for my sanity than anything else, I can only deal with so many accidents in a week.
Good luck, this PT'ing thing is so not fun!
Nancy, mom to
DD1 5/04 and DD2 3/07