My personal experience with leaving my Broody Silkie in the coop ended badly. She made her little nest in the corner of the coop, but the other hens were always messing with her. They would push her over and lay their eggs in her spot, then she would get back on them. I had to remove those new eggs daily so they weren't on a different hatching schedule than the originals. We built a little bit of a cage around her corner...just used little wood slats on 2 sides, and the corner of the coop formed the other 2 sides. We thought it would keep the other chickens away from her and the babies. Well, 4 babies hatched and they were sooooo adorable. By that afternoon, she only had 2 babies. Two vanished in their first few hours after hatching...I was shocked and sad. I think the babies got too close to the edge of the cage and either fell out through the slats, or were pulled out by the bigger chickens. We should have used hardware cloth around that cage...not slats a couple of inches apart. Hindsight is 20/20, right?
Now our little Silkie is broody again, and she is in her very own broody house. It was actually a little goat house, but we don't have goats anymore so we converted it into a small coop and she's happily sitting on 7 Silkie eggs. The other chickens cannot get into the broody house to mess with her or the babies. I hope things turn out much better this time!