My almost 2yr old EE hen has become unbalanced.This behavior just started today. She is eating and drinking ok. I don't know if she's laying---I have 3 EE hens they all stopped laying in the early winter they have just begun to start laying again but I don't know if she has. Her poop is normal, eyes are clear , breathing normal and there is no discharge from her nostrils. She just walks off balance. I've separated from the rest of the flock. She seems calm..... Any ideas