Perhaps you are not thinking ahead? While chickens are flock-dears, she will NOT like to be cooped up with strangers, after her freedom. AND your flock may NOT want a "stranger" added to their company, nor wish to roost near a new bird! She may be more miserable if you capture her. She may be tormented, injured by your comfortable chickens. OR maybe you and she and your flock will say "okay"? Guess you will have to decide, try it, if it can work--but do not be afraid to let her go again, if it doesn't work out! Yes, hawks, other varmint may take her, but chicken are prey animals and do not suffer fear of capture by predators--it is just us who hate so to lose ANY of our chickens--for any reason. Good luck, but do not feel badly, if not successful, you will have tried! But we all would be pleased to hear of a successful rescue!