Regardless of age, the first thing we need to know and you and she should consider before touching AS is
1) what are her goals?
2) what is her background -- does she already have good training & dieting habits? If not, don't bother w/ AS - its not a magic pill and won't do anything for someone who doesnt' have the discipline to see what they can accomplish w/o it first.
3) does she understand the implications of AS for a woman? E.g. which AS has the least sides, all AS have sides, but depends on the person, etc.
4) is she a member of Elite?
Answer the above questions for yourself & her - and get her on here so she can learn for herself. She is the one who will be taking the stuff so she needs to understand that AS has different consequences for women and what those consequences are.