Blues...another lefty here. I learned to play guitar when I was 18. Tho very left-handed in everything else, it never occurred to me to play the guitar any other way but the right-hand way. And because I'm just a front-porch picker, that works well for me as my left hand is doing the hard part. Not true for a fancy picker. I'd advise that she at least try to learn right-handed, if only for the fun of going into a guitar shop and being able to try out all the guitars...