DD is currently being rude/unpleasant to us and DD1 when she is feeling annoyed for some reason (usually trivial but she is 9).
This morning after being asked to do something she said 'I was going to do that in a couple of minutes, d'er' with all the pre-teen anger and contempt she could muster (which was a surprisingly large amount considering what a bloody nice life she leads).
I saw red and promptly grounded her: no swimming this morning and no party this afternoon. She flipped and wailed and screamed and pleaded but I stood firm.
If I allow this now, she'll be at it until she leaves home (mid 30s given economic climate, so a wee while).
I'd rather not stop her going to party but nor do I want this sort of talk aimed at anyone, not me, not DH, DD2, friends, teachers . . .
So, wise MNetters;
What should I have done (something tells me there will be a next time)?
And is there anything I can do to allow her to the party while not backing down and ensuring consequences for what I consider to be unacceptable behaviour?