Hello
@pae and welcome to the forum
Oh I recognise this! What is happening is called confabulation which is a symptom of mid-stage dementia. It happens when the memory is very poor and the subconscious brain is filling in the gaps with false memories to try and make sense of the memory fragments that they have left. It is not lying, because your mum thinks that the false memories are real ones and its all true. If you try and suggest that she is wrong it will probably make her angry because she
knows its true, because she
remembers it......
I also recognise those phone calls where she is telling you about you. I used to say "who do you think you are talking to mum?", but it didnt work - she was losing the ability to use the phone. Eventually she had lost the concept of someone being on the other end of the phone and was just talking into it, rather than to me.
I think your mum now needs much more support than she is getting - these sort of confabulations are often the result of anxiety. If you are in UK, perhaps now would be a good time to get a needs assessment from SS (or an updated one) to try and get her more support, but Im wondering whether you are in Australia. If you are, do say because we have several members from Australia and they may be able to help you navigate the care system there.
In the meantime, when your mum is complaining about you, to you, on the phone just go with the flow and say things like - oh Im so sorry, I'll see what I can do. Dont take it personally, although I understand it feels very hurtful
xx