You could always try and see if bringing another calm hen (if she has a friend in the flock) in with her will perk her up. My bird dog got a hold of my rooster two weeks ago. He was mauled pretty bad. Missing most of his feathers on his back and his left wing. Was in a bad stage of shock too. I kept him in a big brooder box in the chicken pen my husband made when the rooster and my hen were babies. I put both the rooster and the hen in the box together and they were both calmer and I swear I think it played a big part in a quick recovery for the rooster. He is back to his old self and growing his feathers back. The advice I was given was the less stress on the bird, the more likely a recovery. I noticed the rooster and hen were more stressed when they were seperated so I kept them together and some more advice I recieved was to keep their sleeping quarters as dark as possible because if the rooster was resting, the rooster was healing. Keeping things as normal as possible for the hen will aid in healing. Good luck to you! I know and am freshly aware of how traumatic it is to have an injured bird!