Classical guitar is extremely useful for other styles of music. They don't use a lot of chords, but they use a huge number of arpeggios, which will help her to UNDERSTAND chords far better than just knowing their shapes.
Also, she'll learn to count, which is huge. Knowing how to count out a passage is terribly useful for hearing rhythms and patterns.
She'll also learn about variations on a theme, something that apparantly Lenny Kravitz never bothered to learn. Variations on a theme makes music far more interesting and intrigueing.
I'd say that she will be well served by a foundation in classical music.
As far as classical guitar, she will learn proper posture and good left hand and right hand patterns and techniques. All of which is directly applicable to any style of music she likes and chooses to play in the future.
- Zurf
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude