Reluctance to hold weight on a leg can also mean abdominal pain. How is her egg situation; still not laying?
You should give her abdomen a good feel - check for any lumps, eggs, swelling or unusually hot spots. - I'd recommend doing this with a healthy hen first so you have a good comparison to go by, especially for temp as chickens run hotter than we do.
If she tries to brace and squat when inspected, that could mean a bound egg or abdominal infection.
Check her keel bone at the breast to confirm if she's losing condition. It should be well-muscled and not overly prominent in a healthy hen.
How are her feces? Anything unusual to note there? When was the last time your flock was dewormed?