My experience of my MiL is a bit sobering - it was only when she fell and was admitted to hospital that "we " - the family - realised that she have been kidding us for a couple of years in that she wasn't eating, hadn't been to a doctor properly for 15 months (I'm fine !!) etc etc
It was realised that she couldn't care for herself so the 3 sisters took it in turns to staty with her, a week at a time until it got too much. Some respite care was arranged in a care home near 2 of the sisters who visited her every day
The respite became permanent as vascular dimentia was diagnosed
The last 18 months of her life were full of activity, visits, trips out, always someone to talk to.
Unfortunately, one of the aspects of the dimentia is that the hunger is dampened or even disappears and despite the care staff feeding her, getting special drinks and whatever else, she passed away at 91.
But, as I said the last 18 months were far better than the previous
I'm not suggesting that your mum is going through the same, but it is hard to look after an elderly relative esp when they tell you all is well
Hope things get sorted out with care package and whatever else can be sorted