We just bought a 12 year old arab mare who has been alone for the last 8 years and is completely unsocialized. She has been in a paddock with another arab mare for the last month and seems to be doing ok, although the other is definitely the alpha. Yesterday we were out and saw Meesha (our girl) standing completely still while the other mare appeared to be grooming her just above her front left elbow. Meesha was frozen still, she was not participating by returning the grooming. When they were finished and we went to halter Meesha we noticed a huge patch of missing fur along with a layer of skin! It looked sore yet she did not put a stop to the grooming session. Is this normal??