She argues that it's not upto her to run this house when I'm the mum.
It IS up to her though as a full time paid working ADULT to pay her own way! - she eats the food, drinks the drinks, benefits from heating and hot water & electricity supply, benefits from (if not actually using always - that’s another aspect you need to tackle) cleaning products or does she not wipe her arse?!, I’m willing to bet she’s using the WiFi and any tv/streaming services plenty! She’s taking the piss op! You know this I’m sure but you need to assert yourself - I know it’s hard honestly, my own dd is no saint she’s a total slob for starters, but you cannot and should not tolerate such behaviour.
The problem is none of her friends parents take money from them
Do you know this for a fact? One of dds less close friends had told her mum same. Mum contacted me and a few others to check - total nonsense! Only one wasn’t charging their adult child keep and that was because the child has a mild learning disability and was unable to find a full time job at this time (they have since found a suitable college course and I hope that improves their circumstances for their sake). The dd was just trying it on, banking on the mum being too embarrassed to ask others.
She called me a bitch and said she would rather move out
You REALLY need to stand your ground and call her bluff at this stage op. How much is a house share set up in your area? No way she will find ANYWHERE she can live for £50 a month! Even if she were taken in by some soft hearted friends parents would they tolerate long term if at all supporting her when she’s bloody well earning!
Right now in your shoes ALL “favours” would stop immediately. No cooking or cleaning for her, WiFi and streaming etc passwords changed, civil to her but that’s it! She is totally taking the absolute piss!
If she tries to draw others into your argument - I’m thinking ex? Then don’t be afraid or embarrassed to say exactly what has transpired or “protect” her, actions have consequences. If ex is aggro about it tell him he’s perfectly welcome to have her and support her himself! I have a feeling neither of them would fancy that!
You also might find you’re pleasantly surprised by her peers reactions if/when she tells them too. One of dds friends had a similar discussion with her parents, she was willing to pay keep but not the amount they set she only wanted to pay a very nominal amount. When she went out with “the gang” that weekend and told them she expected sympathy and ‘you’re right they’re being unreasonable’ and instead got ‘are you for real?! They aren’t actually asking for much and what you’re offering is a pittance!’ A couple of them inc my own dd had places of their own at this stage and put them very clearly in the picture as to what it actually costs to live on your own! Dd has a spreadsheet budget she emailed to her. While they were in each other’s presence and this girls jaw literally dropped as she exclaimed she had no idea bills were that high. She even doubted it at first. She went home and the next day was suitably contrite and agreed to parents terms.
Why are people having kids they can’t afford? they’re generally not! People’s circumstances have changed a LOT especially in recent years. We’re talking here about dc born 18+ years ago. Britain and the world were VERY different economically then plus people’s personal circumstances change.
When I had dd I was married, in a well paid job, fit and healthy - cut to 5 years later I was divorced (he cheated), unemployed & disabled. Ex wasn’t paying cm in any reliable way either as is the case with the majority of Nrps in this country.
Wages have been frozen so as to have been in real terms REDUCED rather than increasing, there are much fewer jobs.
She expects a lift into and from work cut that out too! She thinks she’s too good to use public transport?! I’m sorry op but I’m thinking a fair bit of this is of your own making! How did she become so spoilt?! I would suggest you need to look at if you have done the same style of parenting of your other dc too and if so start revising things. Not easy when they’re already I think youngest is 16? But it’s certainly not irreversible.
Re washing - let her go to a launderette! Or at the very least simply inform her washing machine hers X-day each week and you do your and the rest of the family’s laundry the other days.
How is her being spoilt down to your parents? Do you all live together ?
To put the wastage in perspective that’s £9k she’s basically frittered away due to her “I’m a princess who’s too good for this shit” attitude!
Nothing, that's not even minimum wage it is - nmw for 18 year old plus her NI and income tax deducted at source, possibly other things too.
If the grandparents don't live with you but are supporting and encouraging the attitude you're getting then she can go sponge off them! Bet they'd change their tune then!