She enjoys building things so a kit will be ideal for her
My personal way of thinking is that to get her some building experience go with a built up wing kit. Otherwise, heck, go for a Bradak 1/2A trainer or a Sig Deweybird that you can slap together in an hour.
I have used coroplast flying wings to teach youngsters but man, they go round FAST and flying on 50 or 60 foot lines is so much easier and the 1/2A's dont pull strong enough to "feel" the plane.
IMO when you get a decent 15 size model on 50 foot lines you get enough feedback from the plane to make it easier to fly, and also you arent spinning around too fast. I actually fly my Flite Streak Jr on 60 foot .011 lines. Its a blast and quite easy to control, especially if you leave it a bit nose heavy.
The Aldrich design Peacemaker is another excellent plane - I am not sure if a kit is available but I have plans for it (originally published in a British mag and also in MAN). On a 15 glow or diesel it is AWESOME! Easy to fly but oh so manouverable.
AJC