Why lock her away?? Keep her in a ground nest inside the coop. It can be sectioned off to keep other hens from laying in the nest. I kept Barb in the built-in brooder in my coop and took her off the nest at feeding times (twice daily). I opened the door to the brooder on day 2 after the chicks hatched and she did the rest.
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The kids met dad on day three. He is awesome with the youngsters.
No pullet dared get within 7 feet of those chicks without getting run off by Barb. She was ruthless. Interestingly, she allowed one of the hens to peck a chick. It was a curiosity peck and didn't harm it. She also let her BFF, Astrid, my very broody BA, in to see the chicks first.
I will allow Astrid to hatch some eggs this year if she goes broody again.
Poor Astrid has just started her molt. It looks to be a severe one like Draco had. I have two more that haven't started molting yet.