I don't know what to do. My RIR hen seem like she can't see. She has lost a lot of weight. and I have been keeping her penned up to see if I can fatten her up. well today I went out to see if I can hand feed her something. and she tried to peck at it but seem like she can't reach it. she pecks about an inch from my hand. so this might be why she is lossing weight. It says in the book that she needs vitaman A. what can I give her?