For over a week now one of my chickens hasn't been right, I thought she may have been egg bound so help her in some warm water for 20 mins. Her comb is floppy and pale and she looks really puffy compared to her sister. She is eating and drinking. She is often found sitting down and opening and closing her mouth and I have heard her sneeze/cough. I have just made her a mix of spinach, olive oil and garlic but she's not eating it. Any suggestions?