Somehow, one of Lacey's Eggs was broken today. Richard discovered this about 1:30pm. He cleaned up the Eggs and gave her new Straw. She seems scared and has left the nest, while she is still in the Brooder House.
By the time Melanie and I got home about 3pm, Richard reported that the Eggs were cold. Melanie headed right to the Brooder House. Lacey seemed to calm.
Richard wonders if there may be something "hardwired" into Lacey. If a Raccoon or other predator would have gotten into a nest and broken an Egg, all would be at risk. It might be the Hen's disposition to abandon the nest.
There is a lot we Humans don't know. So we wait and watch. It will all work out the way that it is supposed to.