Even if the lady hadn't washed the combs, you mean to tell me that this girl couldn't FEEL something was developing until she saw blood on her pillow? Was she just grinning and bearing the tight weave? She can grow that hair back, it's not impossible, but it will depend upon the person. Some scars are permanent. But she should visit a hair loss specialist after her derm treatment is over. I can't believe you can't feel that something is seriously wrong.
Maybe people ought consider virgin hair only? No chemicals.