Hello, mrsgreenfingers56, I am so sorry to hear about your dear Mum, and I feel for you, I know how difficult it is as my sisters and I cared for our lovely Mum, who suffered Alzheimer's for more than 10 years.
It's great that your Mum is still in her own home, maybe "talk this up" with her and help her to see that taking the tablets will enable her to stay at home, with some support, for much longer?
Our family had good support from the Alzheimer's Society, perhaps they can give you specific advice re the Aricept. Our Mum accepted her medication, but they gave us support in other areas.
I know what you mean about "little white lies", I'm afraid we found that was sometimes necessary, for the best of intentions. I know that your Mum insists that she doesn't take tablets, maybe you could say it's to prevent Covid...if she is aware of the pandemic? I know I'm clutching at straws, but sometimes it's the strangest little white lie that actually works!
We had a book called Contented Dementia, with lots of hints and tips for families and carers, maybe you could find it on Amazon, I think you'd find it useful.
Please take good care of yourself, mrsgreenfingers56, it is so important that you have some time to yourself, and share the caring with family and / or professionals.
My sisters and I were still working so we arranged carers for breakfast and tea time, while we had a nightly rota for bathtime, bedtime, laying out next day's clothes, menu, etc. I was able to pop in at lunchtime as I taught nearby. This worked fairly well for us for a good few years before it was time for the nursing home.
I hope you can access appropriate help, I'm sure there will be more people along with more advice, I just felt for you as soon as I read your post and could not leave it unanswered. Please let us know how you get on.