It looks as though DSis is getting to the point of needing a wheelchair. Maybe a powerchair. (Degenerative condition).
Reading between the lines, her GP is pretty useless and she's not due to see her consultant until next year. DSis is quite reserved, almost timid and doesn't like to ask for things or advocate for herself.
What's suppsed to happen with wheelchairs and the NHS? Shouldn't they at least be providing OH assessment and advice? Who does she need to see?
I'd like to help her advocate for herself a bit. Also; She's not the only one in the wider family with the condition, so several of us are likely to need to know this stuff eventually.