I don't think I would bring anyone in with her. Chickens have a cannibalistic trait and may injure her more. I would keep her isolated till healed and then begin reintroducing her to the flock. They have a pecking order and probably have re-established it with her gone. It will need to re-established when she returns to the flock.
Good luck. Sounds like she is on the mend.
Good luck. Sounds like she is on the mend.