We had the same problem. My daughter was 3 1/2 and started having daily accidents after being dry for 8 months.Our accidents were only wetting accidents and never at night - that's why the doc had such a problem with us! He said that if our accidents occured at night too that he would be more concerned. I can pinpoint the day it started even! Our doctor seemed to think that it was a control issue or she was just too busy to be bothered with using the toilet. We did have an MRI to check for a specific condition (can't remember the name) but it was normal. We tried rewards, scheduled potty trips - we were having 4+ wet panties a day. I tried to hide my frustration, but she knew how much this upset me. It was difficult to go out to eat, the movies, shopping, even the grocery stote without an accident. We were almost ready to put her on medicine to 'dry her up' a little, but opted not to. She started kindergarten this year and she has been dry (except for dribbles) since about October - 3 years after this problem started! The dribbles are still enought to change underwear after school usually.
There is a condition that makes little girls(boys too?) have accidents. I think it has to do with a nerve at the base of her spine that gets 'aggravated' as they grow. From what I rememeber, it can cause uncontollable BMs as well as wetting accidents. Our MRI checked for this condition, but it is rare according to our doctor. This is apparently an easily corrected condition according to our doc.
I'm interested in any answers, too!
A. D