There's many better fiddlers than me out there, but for what it's worth as a poor multi-instrumentalist, I can vouch for the fact that a good sound technique is the greatest acquisition for any playing. The rest is in the interpretation of the music you're playing at the time - and in those few words is a lifetime of study for most people.
So stick with the classical training for a bit, and get her some dots for traditional tunes and try to give her a good "listening repertoire" - let her find what she enjoys - you can only provide the resources...
Good luck to you both.
B