GUITAR BOARD

Hi all
Ive been asked by the wifes sister to teach my 11 year old niece
some guitar.
She already plays clarinet by reading music (but is bored with it) and
is a good singer.
Before her mum and dad shell out for an acoustic, (lets face it at 11
it could be a fad) they asked if I could teach her as at present,
there are no places in the guitar lessons at her school.
My starting point seems to be showing her the basic chord shapes (E A
D), and getting the right hand to make a nice easy rhythic stroke
using a pick. My plan would be to increase the chord library (C G Em
Am etc..) and some basic chord theory with a view to her being able to
play a few Avril Lavine songs, my theory being that if she can play/
sing her fave songs quite quickly, it will generate more relevence and
interest.
Is this method is a good one? I dont want to start her off on the
wrong foot. What do you think??

Graze