M.C.
Has there been a change in her life that she might be uncomfortable with? Do the accidents happen at school, and might there be something she doesn't like at school? When I was a nanny, the 3yo boy was fully potty trained before beginning preschool (at a school that required all kids to be potty trained). He un-potty trained himself in order to get out of school--he knew that if he soiled his pants, his mom or I would be called to come pick him up, which is exactly what he wanted! We made clear that intentional "accidents" were not okay, by talking to him and taking away priveledges, but also rewarding when he did well (e.g. a trip to McDonalds after school if he stayed in all day). We also talked to him about school, and what he did and didn't like. I actually went with him for a few days and stayed in the classroom with him until he felt comfortable with the other kids. Once he got comfortable in school, the accidents went away! GL!