Hi Marty, great that you want to encourage your great-daughter to start playing guitar!
Maybe as an "involuntary" lefty I can contribute a few thoughts (I broke the pinky of my left hand when I was a kid, and that didn't heal well, so it's now useless as a fretting hand - picking works fine though).
First thought: It is quite possible to learn to play guitar as a left-handed person from scratch on a right-handed guitar without any disadvantage. The brain and muscle memory are flexible enough, especially in a child. There are some well-known examples of left-handed people playing a right-handed instrument, such as Duane and Gregg Allmann, Mark Knopfler, Gary Moore or Joe Perry.
Now, what are some good reasons to learn to play a right-handed guitar as a left-handed person?
- Learning is easier: You can just copy your guitar teacher without having to "transpose" every single chord into the lefty version. Same is true for chord tabs and instructional videos (there is a trick with a mirror though).
- Interchangeability: You can literally just grab any guitar and start playing, you can try out your friends instrument, you can replace your suddenly broken guitar by someone else's during a gig etcetera.
- Choice: The selection of right handed guitars is bigger, and they are a bit less expensive in average than their lefthanded equivalent (if there is any, at all). Plus on the used market, it's way easier to sell and buy a decent instrument.
- You don't have to talk about Jimi Hendrix or Kurt Cobain every time you grab your guitar in front of other people.
But still, there are some very good reasons to play a left handed guitar:
- You can talk about Jimi Hendrix or Kurt Cobain every time you grab your guitar in front of people
- By learning to "transpose" every chord into lefty, you have an extra brain training - for free!
- You don't have to discuss where your place is in the band. It's on the right side of the stage (facing the crowd).
- You stand out and are something special, to the point where being lefty becomes identity forming.
- You can relate to a lot of great fellow lefty guitar players.
So far my spontaneos two cents. I'm aware that this is highly subjective and for some parts contraversial. Please let us know where the journey leads