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Just worth noting that the standard approach of starting off on a nylon-strung classical guitar is a bit questionable.
I'm sure this is similar to many instruments. When I was at school I quite fancied playing sax (Born to Run inspired I think), but the route to this was through years of clarinet / school orchestra / uninspiring classical stuff which killed my interest eventually.
I can easily imagine how you could make a fun lesson for a kid with an electric guitar and a few pedals / interesting backing tracks.
Just worth noting that the standard approach of starting off on a nylon-strung classical guitar is a bit questionable. It's like a complete beginner trying to learn to ride on a Boris bike. If she wants to play electric there are some decent small guitars around and you can get a mini amp that can plug into headphones or a stereo if you don't mind the noise.