If your mother has an assortment of pills to take it can be worrying that she won't take them at the right time or take more than needed.
MiL suffered from vascular dementia. We had the chemist make up her medication into blister packs eg. in one blister would be her morning pills for diabetes, BP, heart, etc. all together in one blister and then the same for medication throughout the day.
Her carers were not allowed to give her medication but they could supervise what she took at each visit. When she came to us, this certainly made life easier for us, as by then she wasn't able to cope with such day to day tasks. The only pill not included in this regime was warfarin as this was a different daily dose on different days.
She did retain much of her personality but had good days and less good days. She still knew who we were when she died suddenly in her sleep at 88.
My advice would be, don't try to impose our reality on her, it can cause anxiety. We accepted MiL's version of the world and didn't point out her husband was dead, when she was happily talking about him as if he was in the other room.