I've rounded on DD2 and called her a bitch when she was 9-10.
I'm afraid I don't feel in the least guilty, she was being unspeakably uncooperative.
I can't remember exactly why, except we were trying to get out the house.. The world wasn't revolving around her and she couldn't have her own way about something.
I'd just had enough of whinging, moaning and feet dragging.
Like the OPs DD, sometimes preteens do need reminding that other family members have feelings too. Mum's, Dad's and long suffering big sisters, are only able to put up with so much.
She removers me calling her it, she didn't like it, but at 12 she's beginning to understand that her need to be in control, which is her way of feeling safe and secure, is not always easy for the rest of us.
9-11 is a frustrating age, they have outgrown toys, but aren't quite old enough to go into town with their friends.
Comments that might have been a bit cheeky when children are smaller are downright rude when said by a 11y who should know mum's, dad's and DSIS have feelings too.
Sometimes preteens need to know, sorry that is enough.