How long have you had your ex-batts?
Bumble foot is definitely worth checking for if you have had them a while. Guessing that they don't in general get the condition in the cages they are reared in at the battery places but if you have had them a while it is possible.
Are they jumping on and off perches. I was told not to have perches in initially because they weren't strong enough to manage them.
Have you any cockerels? Again told not to let mine run with our boys for a month or so due to their lack of strength.
Kept ours in a smallish run with shut in coop attached for the first month or so.
Hope she is up and about when you get home.