Hi
@Burdgeselina
It's v difficult. The PWD cannot reason or employ logic and so you cannot reason with a PWD. You have to find another way. In early stages a PWD may still have capacity to make decisions and to understand a Lasting Power of Attorney and, if necessary, a new Will - so get these organised as soon as possible. Explain how best you think you can persuade your mum to agree.
Most medics regard dementia, of whatever variety as not being a mental health issue, but being a physical issue as it is in fact a brain malfunction - messages get mixed up (whether finding the right word or not, or even messages to move muscles etc)
After quite a period of non-acceptance or denial a PWD begins to realise that things are not fully normal and that gives rise to frustration and anger.
The professionals will come to realise that your mum is confused and can't understand things or can;t follow instructions, when they start to accept that you can speak for mum. So persevere.
But, sooner or later it comes down to what does the PWD need rather than what they want (or don't want) that matters.
Best wishes.