My three sisters (16 months old) are having a leadership battle. The little black hen Lola has always been at the bottom of the pecking order, but she recently began attacking Betsy (top hen) and subdued her, conducting a successful coup. But when Carson realised what was going on, she began attacking Lola. Yesterday I noticed a bald spot on Lola's back and all her tail feathers were gone. Today she has lost even more feathers. Inside the coop looks like a pillow fight. I'm wondering if she is moulting or if Carson is pulling all her feathers out and I should remove her in case it gets worse. This pic shows her full tail feathers before, what she looks like now, her bald spot, and the coop covered in feathers. Can anyone help with advice?