My hen has been slowly decreasing in health. She and 3 other hens are 1 yr 3 months. they share the coop with 4 3 month old pullets. this hen's comb and wattles have become very pale and her wings are drooping. She tries to walk a little but cant keep up with her sisters. When she does try to walk she tips over like she is dizzy and can't keep her balance. she has been eating a little and doesn't appear to have lost much weight. Please help!