I have a hen who is about eight months old that is sneezing and breathing through her mouth. When she inhales, her beak is closed, but when she exhales she opens her beak. Her breathing looks pretty labored and she makes a wheezing noise when she does this. Also, she is sneezing quite a bit, maybe once every two minutes. She has had raspy breathing for about a week. She is possibly a little lethargic, but is eating and drinking, and she is laying an egg. Any suggestions?