luckyrose62, you will need to make a referral to social services for a social worker for the elderly to come out and do an assessment, you can either do this yourself, or ask the GP to make an urgent referral. The assessment is done in a very caring respectful way, with your mothers interests at heart.
the assessment will look at everything, home circumstances, medication, who does the caring etc... they look at finances, and if your mum has no money, then they have to arrange to fund the care.
they will either decide to put in regular carers if she is very independent and can live on her own, or will look at a nursing home.
As she is already in a housing association flat, is it independent living? (sheltered housing), the next step would be a place where she could get more care. If she is in her own flat, would she manage in a sheltered scheme, there are different levels and she would still have carers going in. She sounds like she is struggling to cope on her own and a more sheltered scheme would give her friends, contacts and a bit of a social life, and less pressure on you.
My advice would be to sit down and think logically, not emotionally, then write a list of the issues for your mum, health and welfare, so you can discuss this when you ring to make the referral.
My elderly parents are fiercely independent (with some serious multiple health issues) , and I am trying to keep them as independent as possible, for as long as that is feasibly possible, but thats hard work in itself, but hey ho :-) its a good job I have a brilliant manager at work, and a supportive OH.
I hope you can work out something that makes better for your mum, it will take the stress off you if she is happier and safer. take care xxx