For just over a week now our 17 week old wyandotte has been limping around and it has progressively gotten worse. She can barely balance at all now and can only stand briefly before she has to sit down. The first four days these were her only symptoms. Then she was unable to make it to the roost and I assisted her each night. She continued to eat and drink and could still move away from the other chickens. Everyday since, she has gotten worse. I have had her isolated for the past two days because she seemed less able to move away from the others and get to her food and water. Last night and all day today she has had diarrhea. Today she shows less interest in food and when I went to pick her up tonight she was trailing drool from her beak. I have searched my books and can't seem to figure out what is wrong. Not sure what to do for her. Any suggestions?