Bill Staines and Jimi Hendrix come to mind as modest left handed talents. Playing conventionally strung guitars upside down. When my left hand was so injured that I was sure I'd never play again I looked into learning Bill Staines style. As I practiced with my right hand on the neck and what still was working with my left hand holding a pick I realized my left hand was getting stronger much my delight and my Doctors amazment. I couldn't have lived as just another really mediocre guitarist who played guitar strangely. I would have given up soon had not my hand gotten better. I think it matters more how you start to learn than how you change horses in mid stream.

I would tell her to try to learn as right handed guitar player. Otherwise she won't be able to just play the house guitar at parties. Definately don't just restring that old Levin you have lying about hovel. You'll wreck the guitar.

Don