You’re very welcome

Try comparing her abdomen to another hens and see if it is bulgy or feels like a water ballon at all. What I’m getting at is that sometimes reproductive issues can cause fluid or pus to build up inside the abdomen and that will put pressure on internal structures. Sometimes there are tumors, also that can do this. If any of this putting pressure on a nerve that goes to her legs, it could make them have leg weakness. The same situation can be seen in cases of egg binding when an egg stuck in a certain spot will put pressure on a nerve and cause leg weakness.
Have you noticed her feathers falling out or pin feathers coming in? That can be in line with molting if she’s stopped laying eggs. She might feel puny and want to isolate bc of that.
Is she being kept from food and water by the others resulting weakness? Is she eating? Try to make a mash out of her chicken feed using water. A lot of chickens find that really interesting. Mine think it’s a treat.
What about lice and mites? Any sign of those? They will suck life out of a hen fast. Check warm spots like under her wings and near her vent feathers. Try looking again tonight at dark with a flashlight.