(((((((((((((((ww))))))))))))))))))))) First of all, I'm glad that your daughter came home. It's wonderful that she has such a talent in doing crafts and things, and she's lucky to have a mom like you.
Either your son or his girlfiend should've been the one to clean up the mess the kitty made. The kitty belongs to her and she's his g/f. Definately give the bill to him. Oh, get him to put up a door/fence or something so the kitty can't go where it's not suppose to. He and his g/f are responsible for the kitty. Worse comes to worse, give kitty away.
I wonder, would your daughter be allergic to kitties? I am. They drive my nose crazy, which in turn, make my asthma act up.
Sorry if I sound harsh. Just that, right now, I have a beef about people who won't own up to their responsibilites. ((((((((ww)))))))