You could try to catch her and lock her in the coop and let the others out. She will get to know the coop as a safe place. It would also be a good idea if you started feeding all of the chickens inside of the coop so that your rogue will see the coop as a place of food and (if you feed them at night/afternoon) will go in there at night/afternoon expecting food, allowing you to lock up with all your chickens inside.

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