I would do the same thing! I am not sure exactly what you meant by invading her body privacy as you will still need to change her pull-ups if she has accidents in them, but I certainly understand that cleaning up poop from underwear wearing kids is waaaaayyy harder and messier! And you should not have to worry about your floors, furniture, etc. Is the school going to take her in September if she is not trained? In JK they actally CANNOT help a child change or clean them up if they have an accident...they are not even allowed to go into the bathroom with the child. I would mention this to the parents to put some pressure on them!