Sweetly point out that even if you did allow her to stay home you wouldn't allow her and boyfriend to see one another :-) She may try to fake sick tomorrow to stay home? So point out to her how her staying home won't work all the way around, no matter what, but her "loud rudeness" to the rest of the family isn't going over real well either and she might not get to see him in any event if she doesn't start exhibiting more age-appropriate behavior? My mother use to tell me I was a little "big for six" when I acted up at that age.