I'm thinking you may have to choose between the rooster and that hen, and only keep one of the two.
After the hen heals up, you could try re-introducing her to just the other hens (with the rooster penned seperately.)
If the hen can re-integrate with the other hens, I would keep all the hens and get rid of the rooster.
If the other hens will not tolerate this hen even after she's healed, then I would get rid of her (re-home or butcher), and might give the rooster another chance. (But if he ever injured another hen, he would be completely out of chances, at least with me.)
After the hen heals up, you could try re-introducing her to just the other hens (with the rooster penned seperately.)
If the hen can re-integrate with the other hens, I would keep all the hens and get rid of the rooster.
If the other hens will not tolerate this hen even after she's healed, then I would get rid of her (re-home or butcher), and might give the rooster another chance. (But if he ever injured another hen, he would be completely out of chances, at least with me.)