My 2 1/2 year old Barred Plymouth Rock has been fairly week lately. She is having trouble balancing and standing. She acted like this a couple weeks ago, so I isolated her and got her on the road to recovery. She was doing better up until a couple days ago when she began the same behavior. I know she eats, I've seen her do it. Her comb is still red and she has no apparent trouble breathing. As a side note, I believe that she has stopped laying due to age because I haven't seen an egg from her in months. Today she was outside (still) while it was raining and we were all away from home, so she was left out. I don't think we'll have her much longer with the way she's going, but could someone at least give me an answer as to what this might be? Help is greatly appreciated.