It sounds as though she has a care company, either through the social work dept or privately, but isn't up to phoning them to ask for help. Could be the start of her losing capacity to look after herself.
Contact your local social work department and tell them all that you posted above. If she has kept herself to herself up until now, and has presumably been coping OK with everything, perhaps it is all starting to be too much for her, and she could do with someone organising all those things that she has been asking you to do. Once you take this on, you will be the go-to for all her problems - which could escalate.