regular sheltered housing does not provide any care.
you would have to arrange that separately.
unless pp means, extra care sheltered housing provision, but that is very thin on the ground.
does your mother actually need total 24/7 care.
could you do some of the changing at going to bed time and then she could have an early morning carer, and a couple of other visits during the day.
it depends how much you or whoever she lives with is willing to do. continence is not that difficult to mange, with modern products, when you know how / get used to it.
washing a disabled person is much more involved, and a careworker would be useful for that.
think around the whole situation. do not expect any useful input from ss and you will not be disappointed.
it's good that you want to support your mother to live the way she wants.