Because if she sat in the nest box for weeks waiting for the fake eggs to hatch she’d die. My understanding of the normal process of hatching eggs the hen will sit tight for a few days until they start to develop. After that they will leave the nest daily to eat, drink and do personal hygiene. When the eggs are a few days from hatching the hen will sit tight again. Since the fake eggs will never start developing she wouldn't move to stage 2.
They arrived home at 7:30. 2 Black Australorps, 2 Blue Ameraucana (the very light one is a Blue, she must be a splash) 1 Silver Laced Wyandotte and 1 Gold Laced Wyandotte
They arrived home at 7:30. 2 Black Australorps, 2 Blue Ameraucana (the very light one is a Blue, she must be a splash) 1 Silver Laced Wyandotte and 1 Gold Laced Wyandotte