Here’s an idea for an invention...sounds like you could have used it, and I know for sure that I could. I’ve been in that situation, too, where I can’t get someone up who has fallen.
Start with a chair seat with a very low profile (2-3” off the floor), so the person can roll over and up onto it. Have it incorporate something like a scissors jack, so that you can raise it to normal chair height - 24-28”. Then, the person can just stand up! (Assuming no bones were broken in the fall!)
Good evening, HJ...that would be a perfect invention!! We could manage the 2-3”. It was good to find out that it is easy to call the fire department for what is a relatively easy call out...no injury (she was lucky), no ambulance, just a “pick up”. We will find out if there is a charge.