One of our pullets seems to have internal swelling. She finished molting within the last month but has not resumed laying. Her weight is good and she is eating and drinking. Although this pullet is traditionally a loner, for the past 4 nights she has not jumped up onto the roost to sleep with the other girls. She sleeps on the floor. When I put her on the roost this evening, she was clumsy and had trouble keeping her balance fore & aft. Afraid that she might hurt herself in the morning when she jumps down, I set her back on the floor. The swelling is below the vent and it's uniform - no indication of a specific area of swelling - her entire underside in the back is swollen. My husband tried to check her vent to see if she's got an egg lodged but she wouldn't have anything to do with that. She is 2.5 years old. Any hints or experience with this is appreciated. Thank you.