We have 6 hens and they are about 6 months old. Today I noticed one of our RIR had a dip in her feathers so I looked more and noticed that she was missing a fair amount of feathers and it was down to skin and was red (not bleeding but seems close). I observed for a while and noticed only 1 picking on her so I put her in the hen house. I don't want to isolate the RIR, it isn't her fault she was picked on but I don't know what to do long term. Is this normal? How to stop it? I will give them more "activities" in the coming days to keep them all busy. She is one of my 3 laying girls right now. The other 3 haven't started laying yet. Thanks in advance.