I have a 3 year old RIR hen that has reciently showed up with no neck feathers in the front. The skin is red and irritated. My husband said he thought he caught her in the act of picking on her own neck. This is one of our favorite hens who is very tame and likes to sit on our lap. In the last 3 months we have increased the size of the flock. However, they have plently of space and often free range. She is probibly the alpha hen in my flock of 8. No rooster. Any tips for what to do?