I noticed one of my d'Anvers pullets wasn't eating and was laying around a lot, so I brought her inside to keep an eye on her. She wolfed down the food I offered her in the house, so I assumed she was afraid to eat around the other chickens. I decided to keep her inside today for observation and so I could make sure she was eating. That's how I noticed that she isn't just laying down, but she's also using her beak to fluff shavings around her. She's also extremely puffy looking (for lack of a better word), with her feathers fluffed up around her. She's only 10.5 weeks though, so the thought of her being broody hadn't even occurred to me but it really seems like it. Is it unheard of/impossible for them to go broody at this age? I took a video of her. Sorry for the dim lighting.