I know I need to let 9/10's of what she's doing go, and I'm not doing that at the moment.
It's very, very hard because there's simply SO MUCH objectionable behaviour at the moment.
Two weeks ago she hit ds1 (9) in the face over pretty much nothing (he said something silly to her as she was passing). The blood was pouring from his nose, down his arms, over the kitchen units and on to the floor. He's tiny for his age and on the whole backs her up on everything because he's frightened of her.
She was completely unrepentant. Said he needs to toughen up before he gets to secondary or the other kids will make mincemeat of him.
She swears in front of ds2 (who has ASD) knowing he'll copy her. She's laughed at him, told him he's sad and has no friends. He's 7 and knows he has aspergers. She has called him a 'freak'. To his face. More than once.
This morning DH asked her to empty and stack the dishwasher as her one chore for the day. She screamed and shouted about how it was 'disgusting', telling him at least 20 times in a loud voice that she didn't want to do it, that she wasn't going to do it. Eventually she did it - DH is very calm and just reiterated over and over again that she had to do it. So eventually she did it, but only after she'd ruined our nice Sunday morning breakfast by yelling and being objectionable, insisting on switching over the TV so she could watch Hollyoaks (we'd all been watching something else) while she did it. You feel worn down by the task of just trying to get her to do the basics.
Feck. If I had a thing for the sauce I'd be drunk every morning now. 
Shag's top parenting tip: join Audible and download a cracking audio book. Get good noise reducing headphones. Listen to book all day and ignore children.
I downloaded 23 hours worth of The Killing a couple of weeks ago. Lasted me for 5 days. Just finished Kazuo Ishiguru's Nocturnes, a Nick Hornby and am about to download another one. Will go for length I think - at least 20 hours of listening.