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You can leave her in the chicken yard, but I wouldn't open the door at night. Just keep them completely separated. Just make sure she has access to food and water and a place to poop. Some chickens never or hardly get off the nest when broody. Mine got up every day to eat, drink...
Does she have eggs under her right now?
Yes, definitely put her in a pen by herself. I would move her ASAP and get her used to the new spot. Chickens seem to get more attached to the nest they pick out than the eggs, so moving them is a little tricky.
I moved mine during the day but I...