Any chance you have a cat or dog you can train as a squirrel killer? Or reach out to see if anyone in the area has any kittens from barn cats that have a reputation as squirrel killers?
Cats are a mixed bag, you never know if you’ll get one that only likes to hunt one thing and not another, but...
I’m so sorry!
There are several things that could cause this, an attack maybe? Are there any signs of injury?
Another possibility is a toxin, exposure to lead, zinc, or some sort of chemical, or botulism.
There’s also the possibility of an illness like HPAI or west Nile.
Vitamin deficiencies...
Sometimes a big egg can press on the nerves leading to the legs and cause temporary partial to full paralysis of one or both legs, so that can cause limping, but it should resolve itself once the egg is out of her system.
Beyond that it might be an issue with the layer feed. Calcium works as a...