I am really struggling with my DD11's behaviour. She's a lovely girl and bright student but when she doesn't get what she wants she seems to turn into a little monster. Some examples of behaviour; she hurt her little sister when they had an argument so I told them both no screen time for the rest of the day (I applied to both because they both let the fight turn physical). That got her quite angry but we managed to turn things around and had a nice day. Then in evening while we are playing a boardgame she lists out all the good things she's done and that she really deserves a little tv before bed. I stick to my guns and say no let's finish the game and then it's bedtime, but if you keep it up you can have tv time tomorrow. She gets incredibly angry, swipes the boardgame. I then tell her to go brush her teeth and go to bed. She refuses and stays on her chair sulking. I end up saying for every minute you are still sitting there I will deduct 50p from your pocket money so she lost £1.50 before stomping off and slamming her door. The other day she came to my room in the morning crying saying she is missing her dad and she doesn't want to go to school. Her dad was emotionally abusive to me and only sees the children once a month. I feel incredibly bad for her and let her stay home for the day. I then hear from my youngest that DD11 told her first thing in the morning she doesn't want to go to school and she's going to fake a tummy ache. Obviously she changed the story but I think I was manipulated into letting her have the day off.
Where am I going wrong? We have the most amazing days together too and I love her to bits, would do anything for her. I don't know if I am being a bit of a doormat and she's observed the way her dad treated me or maybe I'm making things bigger than they are and these arent unusual emotions for an 11 year old? 😩help?