I have a 6 month old speckle Sussex. Her 2 other siblings died. She sneezes and now is also gasping for air when she sleeps. She sleeps a lot. I treated her yesterday for lice as she was completely infested, loss of feathers and very skinny. Wish I would have noticed it sooner. She is eating and drinking but is weak. Her toes are at times curled in as well. I have given her poultry vitamin, dewormer her. She is eating eggs. She is inside in the warmth. Anything else I need to do. Can this be a vitamin deficiency?