My auntie lost all of her hair (including her eyebrows) after the birth of my cousin 38 years ago. It never grew back and she pencilled her eyebrows in. Some children pull their hair out obsessively, and it can carry on into adulthood. I don't know if this is the case with GP, as she says she has alopecia, but as she has a history of self-harming I wonder if this is a continuation (pulling hair out) Alopecia can be patchy though, and I'm not sure if hair loss (patchy or otherwise) from the entire body is the norm.