Honestly, I am not sure I could keep that child in my care unless by some chance, she behaves well for you all day. If she behaves well for you, I would have her ready and hand her off at the door with a quick goodbye. I would also tell the mom that this kind of behaviour can't happen in your home as other kids are watching and leanring. If mom's lack of parenting is affecting the child during the day...I would terminate. This is insane!