I have a d'uccle hen that is approximately 18 months old. She has always been the loudest and most active girl in the flock. Late yesterday afternoon I went out to check on "The Kids" and found her to be ill. She was laying in the corner of the house and wouldn't move. Her best friend has been broody and she has been staying pretty close to her so I didn't think anything of it at first. When I did get her up she just stood there with her feathers puffed out and wouldn't move. I took her in the house and examined her. Her eyes are clear, no discharge from her nose. Her crop feels normal and I checked her tummy and her vent and they seem to be fine too. She doesn't have parasites (we went through that a couple of months ago, so I have been very careful of late) and I checked this morning and she doesn't have diarrhea. The girls egg production has slowed down a good bit lately, but I contributed it the extremely hot days we have been having. I haven't changed their food and they have had plenty of water. I have separated her from the other girls, just to be safe. She is the cutest little thing and I will be heartbroken if anything happens to her. I am also concerned about the other girls, but right now everyone else seems to be fine. Does anyone have any ideas?