I have two RIR cross hens from Ideal. They lay their eggs on the floor in one little corner of the coop and I added 12 fertile eggs from a farmer, so we're up to about 18 eggs. One of the hens is spending more time than usual on the nest, but she does come out of the nest. Today she spent about an hour or so sitting on the nest and this was after I opened the coop. No new eggs and no egg song. When I checked on her she was puffy and a little flat, not a lot. But she sort of cooed at me, like a very loud and sweet and it sounded like a cat purr noise. She's been doing this on and off for a couple of days when I come around the coop. She sits and makes the noise and later leaves and sometimes comes back. Could she be broody? I thought a broody hen sat on her eggs all the time. She is not, she's just spending more time in there than usual.