My poor chicken fussy is getting beaten up by the others & I can't figure out why. We've had the same 7 chickens for 2 years & we got then all as baby chics. They all have gotten along fine until the last week. They have plenty of space. A very large coop with a loft & a roost & 5 nesting boxes. Their outdoor run is 10 by 30 with ramps, sand pit, crates & benches to jump on. It's hard ware cloth enclosed. They are well fed & loved. The only change in 2 years is last week I found 1 of my 7 penny, dead one morning for no apparent reason. After research I'm convinced it was sudden death syndrome & a heart attack or something because as far as I know she was healthy & was alive the night before. A few days after that fussy is being picked on. 4 birds pin her to the ground & stand on her & peck her & make terrible noise. She just submits to it & gets beat up. So far no blood but I'm scared to death I'm going to find her dead next. I'm at a loss. I hope someone knows some answers. This is only my 2nd year with chickens. I'll take any advice or suggestions. I live all my girls & dont want to get rid of anyone or see anyone suffer or die. Thanks for reading.