Is she distressed at all when wee'ing? when DD had a UTI she said her vag1na was hurting, but not all the time, it was intermittent, and not always when she peed. Having said that my cousins DD had a UTI with no symtoms other then weeing in her pants, so maybe it's worth getting a urine sample checked for a UTI. UTI's can be nasty in kids and worth investigating IMO.