I don't know anything about this but could it possible be that she has dermatillomania. Google it, there is a lot of information. I went to elementary school with a girl who had trichotillomania (pulling out hair, eyebrows, eyelashes, etc.) and that is what prompted me to google and found dermatillomania. I think you made a good call asking your son to talk to a counselor about it. From what you have described it sounds like she definitely needs some help but who knows how her parent's would react to you contacting them directly.