You have my sympathy. I reached a crisis point last summer in the UK and got social services involved. My mother accepted carers, though she wasn't too keen but we promised they were for a period of 6 weeks. And of course it never stopped and she is mainly accepting now. It was good to be able to say I didn't organise it.
She's now rebelling against the frozen ready meals saying she can cook herself rather than the carer just heating up meals. She can't, she got into a foul mood on Friday and I just had to leave the house with her yelling for me not to come back ever. She was also complaining about the food I bought saying that most of it would be eaten by the other people. She lives on her own and got more frustrated to me asking which other people. I still feel the need to question some of the nonsense as sometimes behind all the odd words there is actually something that needs doing.
It's a thankless task trying to care for someone with dementia. My mum was also quite manipulative and my sister and I sometimes think she is more aware of her surroundings. Sadly I have run out of empathy for her.