Been through something similar with my Mum a few years back. Did the hospital give you any info on ‘confusion’, which is a known side effect of such falls?

All one can do is to be there for her, preferably turning up at a regular time of the day as predictability is key. Try to avoid surprising her, or doing a data dump of new information, cos it may not be grasped fully. This isn’t the moment to attempt to get her to agree to home help etc. I made that mistake with my Mum, and so did my brother who didn’t understand that my Mum couldn’t grasp new information at that point. It didn’t end well. Also, I suspect your brother & SIL aren’t going to be much use. Try to be there at least once a day.

You might like to get her a radio with simple controls - the twist sort - with comfy headphones. If she’s got low or no vision then having some means of blotting out the other activity in the ED or hospital room is very helpful. Phone apps rely on vision to operate the controls. Boredom and the ceaseless sounds and activity around her is a nasty mix when she’s trying to sleep and a radio helps. My mum also felt better when she had her favorite shawl/throw to wrap herself in as she found the hospital ambient temperature too chilly for comfort.

Clean clothes/laundry, hairdressing etc. will also help her to feel better. The nurses can’t do all of this, so you or other rellos will probably have to do this as required. Also familiar food - hospital food varies a great deal depending on the hospital and the time of day. Not all of it is edible imo. If her doctor agrees, then homelike food is good.