A.K.
Hi A.,
It can be difficult when a previously "trained" child begins to have several "accidents" but if she is doing it daily it is no longer and "accident."
Try to figure out if something has happened to cause her to be uncomfortable with the toilet (ie. overflowing toilet, constipation, another person, etc.).
If it is none of these. Offer her a reward (ie. a sticker or 1 skittle or raisin or whatever you choose) when she goes for 1 hr without pooping her pants then ask her if she want to try the toilet. Every hour that goes by, make a big deal about her NOT going in her panties (maybe use a party horn or something like that to make it a celebration).
Have her sit on the toilet every three hours if she has not pooped. Read her a book or something to keep her on the toilet and encourage her to "go". If she doesn't go after 5 or so minutes let her get off but put her on again every 30 - 60 minutes so she will have the opportunity to "be successful."
When she does go, make an even bigger deal about that one (call daddy at work or grandma or a close friend so that they can gush to her over the telephone about what a great job she is doing)
I guarantee if she is being stubborn, this will win her over.
Of course you do not have to continue this intensely for more that a few days as she will pick up on your approval really quickly. Then when she takes the lead, remember to let her know how pleased you are with her choice and maybe give her a sticker or draw a smiley face on her hand or something every so often to reinforce her good choice.
Happy mommying,
A. K