End of term school disco tomorrow night.
Dd (8) has been foul for a couple of weeks. Simply a very rude, and at time downright nasty, little madam. I suspect she's worn out and needs the holidays to rest but she's old enough to know that tiredness does not excuse talking to her family like dirt, rolling eyes, slamming doors, stamping up the stairs etc.
Nothing has been working discipline wise (taking stuff away, early bed etc) and at one point I went in the loo and burst into tears. She's making us all miserable 
She's already upset me since getting home from school (demanded her apple chopped up and stamped around and called me mean for saying 'I'll do it in 5 minutes').
If I tell her 'If you're rude to me again or stamp or slam a door again you won't be going to the disco tomorrow' and follow through with it, is that really harsh?