Then I'd mark the eggs you give her (I use a black Sharpie) and let her brood in there. Check under her every day to make sure the others aren't laying with her. That way when she comes off the nest to eat, drink, and poop she'll still be with the others, probably means no reintegration when...
In my opinion the question is not how many hens you have but how much room do you have and what does it look like. I let my broody hens hatch with the flock and raise the chick with the flock but I have an 8' x 12' coop, two other shelters, and over 3,000 square feet outside. It doesn't sound...