I have 3 hens that are about 2 years old now. 1 of them stays in the coop most of the day. Sometimes she's setting on eggs and it seems like she is trying to hatch them even though there is no rooster in sight. The other 2 will roam around while she stays in the coop. Sometimes she will join the others, but for the most part she stays inside. I worry for her health and wonder if there is anything I can do. Her behavior has changed a lot... any advice would be a great help. Thanks!