Welcome to an extremely quiet forum as I type.
A few observations.
A kinship carer !
Special thread which contains information for you in that role : https://www.carersuk.org/forum/news-and-campaigns/latest-caring-news/kinship-and-or-family-carers-guidance-news-articles-this-forum-supports-kinship-carers-cuk-does-not-31009?hilit=kinship
What outside care support does your grandmother receive ?
A guide … what’s available , and who provides it :
Needs and Carer Assessments … through your LA … upto date / in course … links to both follow :
The Care Needs Assessment Explained | Age UK
Carer's assessment | Carers UK
Your grandmother … what precisely is her health issue ?
Housing … what would YOUR position be if a move into a care home was the only option ?
( I assume your grandmother is a home owner … and NOT a tenant , either social or b.t.l. … that dreaded word SUCCESSION ? )
A Plan B in that eventuality ?
Benefits … including a potential Council Tax discount / disregard … all being claimed ???
An online benefits calculator for the full m.o.t. :
AGE UK … grandmother on their radar ?
Will / power of attorney … in place / course ?
The above will give you many things to ponder on.
In CarerLand , it pays to ACT as opposed to REACT … only you can change things … nobody on the outside will do that for you … at best , increased outside support.
Your best friend … that ugly , drawn , face that stares back at you … from the mirror ?
Others will be along to extend their welcomes.