Also, from what you've described, her behaviour doesn't sound like that of a typical 6 year old - she sounds more like a 3 year old, which would be understandable with the trauma she's suffered. I think you need to bear that in mind, when dealing with her behaviour. It's not unusual to ask a 3 year old if they want to go for a wee 5 times and them say no, even when they're crossing their legs and doing a little dance! I know, I have one. Take a change of clothes when ever you go out.

I've also read that issues with bladder control, can be a symptom of sexual abuse - another thing to bear in mind.