If she's been away from her flock for about 4 days or more, without seeing them, you might want to watch carefully when you put her back that she doesn't get pecked too much. Even if she is healed, if she is out of their sight very long, they will all need to do the pecking order thing again, so ALL of them might start pecking her. That's okay as long as no one is actually getting hurt., and it doesn't continue past a few hours. Chickens will forget that they know another chicken in a surprisingly short amount of time. That's why I like the dog crate in the coop as a safe place to heal. The other chickens still see her and don't have to get reacquainted.