My Barred Plymouth Rock has lost a lot of weight and is having a huge issue pooping. Her poop is getting all bunched up in her butt feathers and some is so stuck to her rear that it will not come off. She's still eating and pecking to get grit (and I supply extra for them). There are no worms in her poop (I brought her inside to observe her) and she doesn't have mites. She's acting "normal", if that can be said for a chicken. She isn't acting lethargic or having other odd behaviors. Is something going on with her or is this normal for that species?