My 2 yr old jersey giant is in rough shape. She's breathing w. an open mouth, sneezing and her comb is darker than her sister's. She's had this going on for a few days, but today her feathers were rumpled and she wasn't interested in scratching and pecking like the other ladies. I brought her in, gave her some tylan and I've been watching her. She's eating wet foods (melon, sweet corn) with no problem, but dry food (millet, seeds) make her cough and sneeze. She'll drink water but only when I prompt her. I can feel a bump in her throat that moves, but I haven't had a chance to check if any of my other chickens have that. She doesn't smell bad, no bubbles in her eyes, her nostrils aren't especially cruddy, she's pooping normally. Any ideas?