One of my adult BO hens went missing yesterday. We let them out when we get home to have a few hours of free ranging, and just keep our eyes on them. Well, I went out to give them a treat and one was missing. I called and nothing. I had my son go walk around looking for her and he couldn't find her. I assumed the worst, that something had gotten her. After supper I decided to go look for her myself and just behind our house in the woods, there she was. She was just laying there, looked like nesting. I started walking through the brush to get her and she started squawking. The rooster came running and chased her back with the group and she flew out of the woods and joined the group. Any idea why she did this? I've never had one do that before. I'm wondering if it was some kind of broody behavior, but there was no egg and I'm pretty sure this chicken isn't even laying. Any ideas?