For me, it took awhile. I mean probably a year or so before I felt like my hair was back to "normal". There was always some growing in that was about an inch long or so and stuck straight up, and I had to try to look "professional" at work. I think it is something that has to change from the inside out, and the less you do to the hair, the better. When at home, I would just leave it down. The other stuff might help to pull it out if it is coming in less think or weaker. After a few cycles of hair growth, I would bet it might start to look as it once did. AT my age, my new hair came in gray, but that's another story =) How is she doing emotionally with the adjusting.
You know, I read awhile ago and completely agree, that when diagnosed with a chronic illness, a person, even a child really needs to go through all of the stages of greif. Even if they seem to be doing well. If you read about greiving, it may help to assist or to anticipate these stages. I really feel that this is vital, and whether it is done with the help of a non-biased conselor, or a supportive family - I feel it is vital. Some people can take as much as 10 years to come to the acceptance stage, and I can attest to this. I was a bit older when diagnosed, 15, and even though I was going through the motions of caring for myself, I never really accepted it in a big scale. It is difficult for children and teenagers to face their own mortality, which is almost what you have to do in order to be proactive withyour care. It was not until I worked though the denial and anger, which for me took years, that I was able to have a healthy perspective with my care and my health.

Please do keep in touch and ask any questions. I wish her the best.