Hi tink2dw,
I agree with DramaTech on getting involved with as much theatre as possible. I went to college for theatre tech and what my program did was to make sure that each of us had an experience in each are of production, so I did props, set construction, lighting board, lighting design, set design, sound design, sound board, box office, marketing, acting, directing, stage managing, costume design, make up design. We were also required to take a course in sociology or psychology so we could learn good problem solving skills. Stage management is an amazing part of the production process and the more you know about the other production designers jobs the better you are at assisting the creative process. There is a good guide to stage management called the Stage Managers Handbook, I now mostly use it to modify all of my report documents, but I often use this book to teach young people stage management. You can usually get it from any bookstore.
The other part of stage management is just practice practice practice, theatre is a craft and to get good at it you need to keep learning and updating your skills. Every time I do a show I add something more to my stage management book that I never thought of or needed in the past.
I am fortunate in the fact that I now get paid to stage manage and that I hopefully will soon be a company member in the theatre that I have worked with for over two years now. I have found that if you want a career in the arts you need to be dedicated to it and never stop dreaming of your goals.
As with DramaTech, if your daughter has any questions please do not hesitate to email me.
Hope this helps.
faeflora