All too familiar!
As Jan and I had no family of our own and relatives were miles away, and there was scant help available, the only thing I could do was to drop everything and be with her 24 hours of each day. That stage lasted for over 6 months.
Hooray for the Internet and Tesco's home delivery service, or we wouldn't have eaten!
Of course there were occasions when someone could come and stay with Jan for a couple of hours, but she hated that. She became obsessed with the idea that other people came to the house only to eat her food - even friends of long standing.
She point blank refused to allow one care assistant in because she was 'too fat' and clearly would eat everything in sight. [well, she wasn't a size 10, but I've seen much bigger!]
Day centres weren't an option as she wondered why she was there with so many old people [she was about your Mum's age then] and I hated having to ask staff to divert her attention while I bolted and left her there, on the three occasions she went. Then I would sit at home worrying about her, so I got nothing done anyway, and it took me ages to bring her back to normal again afterwards. Situation was resolved when the day centre threw her out as being too much work. I was relieved, frankly.
With this condition, you often have to go through the motions with things you know won't work, just so the social services etc can tick off a box that something on their list has been tried.
With no attention span at all, the best we could manage towards the end of her time at home with me was to sit together for hours, holding hands, with me trying to make simple conversation. TV, radio, music... all useless as diversions.
It is a challenge I never really won. Sometimes the anger was easier to handle than the tears.
All you can do is your best. Keep trying things, anything that you think might be a diversion.