One of my Guinea hens has been blocked up for about 6 months and it's not going away. She breathes though her beak sometimes or just sounds really blocked but otherwise she's fine. Could it be an allergy to something, or a worm or something else I could treat? The bedding is sand and they eat layer mash. Her name is Rainbow. Another hen Jolene is occasionally blocked at nighttime in winter but she never has to breathe thoug her beak, and the rooster has been blocked once or twice. But Rainbow is very blocked and I'm wondering if there anything I can do about it.