Can I play devil's advocate here? Health and Social care are two completely different things in terms of budget. What may be perceived as a social care issue would not always be considered so by Social Services and vice versa. Budgets are being slashed to the bone, care companies charge an absolute minimum of £16 per hour to both Social Services and the public for providing a careworker (sorry to be pedantic but they are NOT carers - carers are unwaged who look after family members). There are people who are absolutely desperate for support, families with disabled children, families of those with Alzheimers who are coping with almost intolerable situations. They are often getting little help or if they are, what they have is being cut drastically.
I don't know the exact situation of the lady you are talking about, and would just like to say to CarbsRok, not everybody is capable of being proactive. If there are learning disabilities, or mental health probs for example - but I digress. If it is an issue where with better care, her diabetes and it's control could be improved, then she should be encouraged to get the proper help she needs with that. For anyone to have Social care, there needs to be a full assessment of need, and why it's needed. Perhaps rather than this battle with SS, you could support her with a visit to her diabetes team at hospital? I'm assuming if she has brittle diabetes, she will be under the care of the Endo team?
Just my thoughts.