B.P.
I'm wondering if the behavior issues don't stem from her embarassment of the accidents which she hides by acting out.
I've known of children who had accidents until 8 and finally got relief from a chiropractor. If the nerve that runs through the sacrum (sp?) is in a bind it won't hurt but can cause loss of sensation to the bladder and bowels.
If you are in the Abilene area I can refer you to a great chiro.
Other wise, you might suggest discussing this with her regular doctor. There are lots of medical issues that can cause this.
If all medical issues are ruled out, then you start on the behavior. This is not something that is "normal" and she may need professional help. Has she ever been abused? This is acutally a tell-tale sign of that as well.
Good Luck to your friend and mostly to the little girl!