I have a buckeye hen (9 months old) who has been staying in her favorite nest box for the past 2 days. There aren't any eggs under her. She's not laid an egg either day (and she normally does every day). She just sits in the box being very quiet. She's normally the first out of the coop in the morning and is all over the yard through out the day...but the past 2 days she's barely left the box. Has she gone broody?