My ameraucana hen is 2 years old. Everyone is molting and she hasn't laid in about 3 weeks. She is eating and drinking. But yesterday we saw she was wobbling a bit, standing still in one spot but leaning back and forth, looked almost like she was asleep while standing. She has fallen a few times when running. She seems to be sitting way back on her legs - legs are not straight down under her but at an angle- both the same angle so weight is over her tail. She is moving around but leans a bit like she's drunk. She looks maybe like she's lost weight but with molting is hard to say. Eyes and beak clear. Not sure on poop - I don't see any in the coop that looks strange. Legs and feet do not appear to have any visible injury or wounds. None of the other 3 are having symptoms and generally seem to be hanging with her, I have had a sick bird before and they usually separate themselves from the sick one. In Southern California, weather mild. Ideas?