I know IABU and I desperately wish that I did not feel like this.
She is bloody horrible. She just told me that she would 'knock me out' because I insisted that she gave me back my phone immediately and did not wish to 'wait a minute'. This is the same phone that she has sneaked to school each day (actually my business phone!) as she broke her 'trendy' one (the 4th one) and did not want to take the bog standard replacement I got her. When I told her to go to her room and think about why that is not something she should say to her mother, she told me she would call Social Services, a common threat!
She has previously told me to 'go die', 'go get cancer' and other similar unpleasant commands. She whacks her brothers, does nothing to help out round the house (except for getting up at 6am and putting single items in the washing machine then going back to bed and later tumble drying them as she 'needs it'.) She steals money from my purse although she is given a reasonable amount if she wants to go out. She will not do chores though so does not get pocket money.
She has been like this for 3 years and I am sick of it. I am really starting to not like her. I talk to her all the time (when she is not shouting as us) and she is fine for a few hours until she is told to take her plate to the kitchen, get off the computer etc. Oh she broke her laptop within 3 months of having it and thinks she can just take mine and drop it 'accidentally'.
I actually grieve for the DD that I used to have, this one is like a stranger.