At her young age especially, the wrong vocal technique (even if she is making it up while she sings along to rock CDs) can have a very bad effect on her voice. Find a GOOD voice teacher, not just a coach, but a teacher... one who understands the physiology of the voice and how to work with individual students. Too often, coaches teach a "style" but have no idea what they are doing that can set up bad vocal habits and create problems for a singer.

Learning good vocal technique will preserve her voice for a lifetime at its peak potential - bad technique will ruin her voice, maybe even permanently. I know that sounds harsh, but it is true.

Contact your nearest University music department or your local musicians union to get referrals. Without having someone knowledgable to see and hear what your daughter is doing with her voice, there is no way to teach her exercises that she needs - it has to be a custom designed regimen based on HER voice, where she is in development, what type of voice she was born with, etc. Buying a tape off the shelf may be for someone who has a different type of voice than hers, most probably adult singers, and will not be a good way to go. Personal, face to face guidance is essential. The voice is a delicate thing and needs to be handled with care.

Alice