My favorite hen has changed personality overnight, it seems, and I'm worried it might something medical. It's been a week now and it almost seems like she has brain damage. Before she was a top dog, with an active personality and a voracious appetite. Now she stands in the corner, head withdrawn into her shoulders, staring into space. When food (corn cob, dandelion green, bird seed) is offered to her by hand, before she would go right at it; now she looks at as if confused. (I've described the difference in more detail in a posting under chicken behavior/egg-laying, subject: Why has my hen's personality changed overnight?) My paranoid mind has me worried that it might be from some feed in the feeder that got moldy (orange and blue growth). But then, if she ate it, likely the others did, and none of them is acting weird. Some basics: She is eating, though I've only seen her eat out of my hand (not to say she isn't eating from the feeder, I just haven't seen it--likewise drinking) She is 17 weeks, a Buff Orpington Flock is six hens , all the same age, none has laid an egg and they do free-range. Help, anyone? Would appreciate it.