sits in coop

My chicken has been sitting in her nesting area for 3 days. She is alert and doesn't appear sick. She has no egg under her. How do I check for a possible stuck egg?

Hi all! Long-time member of the Backyard flock and I want to take a moment to thank you all for your posts in the past because I have solved almost every chicken problem I've had with this site. However, I haven't found one pertaining to my situation this time so I have to make my own. I have a...