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Update:
I wasn't there, but my sister was and I think she said the ambulance finally turned up at 10.45pm.
She had fallen upstairs and they had to hoist her into a wheelchair so that they could get her in the lift to get her downstairs and then get her out of the wheelchair onto a stretcher. I don't know why, but for some reason they couldn't put her on a stretcher upstairs and bring her down the stairs.
Anyway, she's broken her hip and apparently it's very complicated. She needs half a new hip (or something like that - I'm quoting what I recall being told from my sister). It's very high risk with her condition and she'll be in surgery soon, because apparently they like to operate within 36 hours of the trauma.
We've also been told that if she survives the op, the life expectancy for someone like her is typically 12 months ..... so it's all looking a bit grim at the mo :(