I have a 11 month old hen. She is very sick. She is breathing slowly and heavily. Her comb is a pale yellow. She can barely walk and she kinda falls over when she tries to stand She slept all day and she doesn't open her eyes if I pet her or give her some food. I am very worried. She has been like this for almost a week. I've given her antibiotics and vitamins. I make sure that throughout the day I make her drink and eat a little. I've checked for mites and lice but I haven't seen any. Someone please help! I don't want to lose her!