I have to agree that a girl that age shouldn't behave that way and if the parents aren't working with you it's hopeless. That is my unwritten rule for my daycare but I do mention it to parents at the interview. I will go through ANYTHING and have, as long as the parents are working hard to improve any issue that arises. If not, I have terminated 2X in the past because of that, but have also continued with 2 other difficult children who came around quickly with their parent's wonderful help.