I've had problems with the nest during incubation if the birds are all together; other hens get into the nest, lay more eggs, damage and dirty the incubating eggs, and definitely lower the hatching rate. I use a large dog airline crate, set in the coop, bedded, food and water inside. IN THE DARK at night, I quietly move the broody and her clutch into the back of the cage, with as small a light as possible for me to see what I"m doing. She stays in, with minimal cleanup as needed, until the babies are about a week old. Then they can come out, preferably while the flock is free ranging, for a gradual introduction. The cage stays until she decides to not return to it at bedtime. The broody and babies eat flock raiser, not layer. Single chicks can get killed by flock mates if they get out without momma; happened once here when TINY bantam babies slipped through the cage door. Make sure it's not possible. Mary