I've had those kind of parents....who expected me to bend over backwards for them and when I didn't they chose to leave. No skin off my back! I MUCH prefer when they leave on their own so I don't have to be the bad guy and terminate. They will quickly realize that life with you was pretty darn good and maybe they will realize that they are in the wrong for some parts of it....or maybe not? But luckily she won't be your problem anymore!