what age is considered to be 'teenage' with girls??

[miku]

My DD is 9, and is showing classic hormonal behaviour, and beginning to be a 'teenager'....I want to get a book to help me to help her, but not sure if a 'Kids' or 'Teenage' is appropriate yet. ideas please!!

I don't think that girls become teenagers any earlier than boys. I'd look for a book on puberty, perhaps Tweens or pre-teens.