My one and a half year old buff orpington, Blondie, was one of the top in the pecking order, and frequently would peck or even bully other birds lower in the pecking order. She was never brutal or anything, just regular hen pecking kind of stuff. But a couple of afternoons ago, I went in the henhouse to feed the birds and found her cowering on the floor, her wing caught in an awkward position between the cinder block that I keep their waterer on and the wall. She didn't just look frightened, she was genuinely fearful, and looked like she got in that position from possibly warding off an attack. She was also very weak and her red comb was drooping, something that has never happened before. I gently freed her wing and picked her up. I wasn't sure if she was sick, or just what happened, so I brought her inside for the night and put her in a dog cage we can set up for such occasions. We wanted to observe her, to see if she was sick or something. She seems to be a bit lethargic, but not too badly so. My wife and I both had to go off today, so it was late in the evening before we could put her back in the main henhouse again. She seemed to mill around with the other hens, just sort of doing normal chicken stuff, other than seeming a bit slower and less energetic than normal. Then we noticed that one of our other hens, Cathy, ran out of her way to jump her and attack her. The two stood up to each other the way hens often do, and were fighting one another, when into the middle of the ruckus runs DaddyRoo, their rooster. Normally DaddyRoo breaks up fights between hens. But not this afternoon. This afternoon, he joined in the fight and started beating up on Blondie right along with Cathy. They were pulling her feathers out, and generally being pretty violent. So my wife got in there and swooped Blondie up to get her away from them. She held Blondie for a few minutes to calm her down, then put her back down, away from the two who attacked her. Blondie milled around a few minutes more, then Cathy jumped her viciously again. And for a second time, DaddyRoo ran from clear across the chicken yard to join in the attack against Blondie. This time, I grabbed Blondie and penned her in in a special segment of the chicken yard where we can lock a bird or two up away from other birds. This kept the other birds from being able to attack her, while it allowed her to be just a wire fence away from the rest of the group. She stayed in there until right before dark, when we let her go free to see what would happpen. She went directly in to the main henhouse with all of the other birds who were claiming their perches for the night. But instead of climbing on a perch, she went into the secluded egg laying area, to hide away from the other birds. She was terrified of being in their presence. I didn't know what to do, so I scooped her up and brought her back inside for the night. She's sleeping over in the dog cage across the room from me, which I covered up with an old Army blanket to give her darkness to sleep in. What could cause this sudden change in behavior? And more importantly, what do I do now?