Girl in my cl and talking back?

Well, of course you tried to understand and had good intentions. However, considering the cirstances, and how she doesn't normally act that way, there was probably something wrong. Just try to be understanding of this girl, she is probably going thru a tough time. I think you handled it correctly, but maybe not be as harsh as you normally would be. Maybe hint that she's being a bit disrespectful next time (if there is a next time).