I also agree with Karen. If she has it clearly written down what is expected of her, she can't prented to be igorant about it. If she continuously refuses to do what you reasonably ask, I wouldn't feel inclined to keep her there. She is 22 and is definately old enough to be taking care of herself.

I'm only 23, but last year I was graduated from college and taking care of myself, as I did all through college. Obviously, everyone is different but someone did her a terrible disservice by allowing her to be so immature.