Sorry I had to dash.
I just saw a similarity to my own dd who is 11 now and still a challenge. I made all the classic mistakes in thinking along the lines of 'punishment' and wanting her to behave at home as she did out of the house. Eventually I realized that all I was doing was pushing her away. The advice given on the aha website went against everything I thought I knew, but out of desperation I followed it. And it worked! my dd is a bright, feisty, emotionally needy little girl and It only ever goes pear-shaped now if I react badly to her challenges. we've worked on it so much over the last couple of years and things have really changed. She bottles so much up during her day, at school she's seen as a confident high achiever, and I realize now that I'm her release valve and when she needs to blow its going to be at me. It's not personal, it's almost an honour.
Your little dd has so many changes to deal with at the moment; so much stuff going on. She's taking it out on you because she trusts you. Next time she plays up stop what you're doing and pick her up give hugs and cuddles, sing her a lullaby, whatever soothes her. don't say too much just let her get it all out. after she's finished, and she's ready to talk you can ask her what it was all about it. She may not be able to tell you but you can discuss her behavior and impose some sanctions if necessary. but it may be by then that she is genuinely sorry and you'll be able to tell that whether she says the word or not.
If you're cooking the tea, just turn it all off give her what she needs. If you eat toast for a few days while you get on top of this, that's not a bad thing. If you need to wee and she wont let you ask her if she'll come and 'read' a story or chat to you while you're on the loo. It wont last forever.
I also have a dh who is mostly not here, he backs me up 100% with discipline issues, but it's hard having to take the lead all the time. I'm still a shouty mum sometimes; none of us are perfect, but our relationship is lovely at the moment. we're at the 'talking about puberty' stage and i'm so flattered she is coming to me for chats about it all.
There's some brilliant advice upthread about making sure you get a regular break and ignoring silly behavior and taking things lightly. Definitely do this if you can.
Also, if it's any consolation my ds (9) is never a challenge in this way, so I really do think it's a personality thing.
Sorry this is such an epic post
. Just take it one little step at a time and I know you'll get there quickly.