I need help in finding out what is irritating the heck out of my hen. She has lost feathers around her head over the past couple of months but only in the last 4 days the poor thing is constantly bowing and pulling her and shuffle backwards like she is going to be beaten by another chicken but she will do this persistently by herself. She does scratch her face and rub it on the ground frequently. She had ivermectin about 2mths ago and again last night. Also tried olive oil with peppermint and tea tree essential oil 2 nights ago. Sprinkled diatemacous earth over her twice in 4 days and cleaned pen yesterday sprinkling diatemacous earth everywhere and so far nothing has helped. Any ideas what is agitating her so bad?