To snap hens out of being broody, we place them in solitary confinement without food, water or a nest for a couple of days in a pen we have. Their in the shade, and it doesn't hurt them long term. Without isolating the broodiness out of the hen, they'll cause squabbles, cracked eggs, and busted eggs for up to a month. I brought rattlesnake up to isolate her, changed my mind and made her a quick nest and placed four eggs under her. She hatched one today.