I am mad for you! I'm a really nice person, but I think that would have sent me over the edge. I would have had to say something to dcm right then, she definitely feels the same. I know, easier said than done. I agree with other pp's. If you get paid for her even if she's not there, I would take her tuition and then give two weeks when they get back.
I'm sorry they are treating you like that.