I have a chicken that is approximately 5-6 months old. She is a Red Sex Link. We got her (and three of her sisters) about 5 weeks ago, and we were told they were around 18-20 weeks of age. The chicken in question (named Moisturizer by my 3 year old) has a number of symptoms that may be of concern: 1) she has a chronically dirty backside, 2) a floppy comb, 3) she is rather rotund (compared to her sisters), and 4) has trouble flying/getting into the chicken coop. She generally roosts on the floor at night. She eats and drinks fine, forages with the others, and has bright eyes and seems alert. We have bathed her, but her rear area gets soiled almost immediately. I don't think she has ever laid an egg (we are averaging 2 per day from our 4 chickens). I have read about egg binding, but it seems that is more an emergency situation...this has been going on for weeks. Any ideas of what we can do or should be doing? Or what this could be? We are feeding organic layer food, they have scratch for a treat, access to oyster shells. They forage in our year/woods during the day. This is a small backyard flock, and I am not a farmer...so have no experience in such things. Thanks!