My hen is about 8 yrs old and stopped laying eggs about 3 yrs ago. She's become very lethargic, pale comb, lost weight (pronounced keel), eyes closed, hunched on heals, puffed feathers, won't walk (just sits as if too weak), won't eat or drink. Breathing normal and relaxed. No gurgling. Eyes and nose clear. No sign of mites or lice. Poops non existent all day in quarantine. Rancid smell coming from her, pretty sure it's in her beak/breadth. Also pretty sure it's not sour crop as she has a very empty crop at the moment. Forced some greek yogurt with electrolytes in her beak and warm honey water. She isn't happy with me. Any suggestions?????