hello everyone. I have a golden laced cochin bantam hen that has been sneezing and shaking her head for a couple of weeks. I have been giving her tetracycline for over a week and she shows no signs of improvement. She eats and drinks plenty. Other than the sneezing and shaking her head when she does it , she seems fine and active. Any ideas on what could be wrong with her and how to treat it? Thanks so much.