I'm new at this so I need some advice. Our Australorp pullet, who's only been laying for about a month, won't get off the nest. She's been on there going on 3 days. She laid an egg again this morning next to Welsummer's egg (hers was still warm when I removed the eggs) so she's not got an egg obstruction, I don't think. They both lay 5 or 6 eggs a week. We have no rooster- will unbred chickens become broody like this? She doesn't seem sick otherwise and when we take her out and hand-feed her worms, she eats them ravenously. She acts normal if I take her out and put her with the chickens, will eat the crushed corn treat, etc, but within a few minutes wanders off from the other ladies and goes straight back to her favorite nest box. I'm worried she's going to cull herself. Suggestions?