Since knitting is done using both hand simultaneously, whether she is left or right handed doesn't really matter. It will depend on which hand she feels most confortable holding the yarn. I would start by trying to teach her how to hold the yard and needles. Have her try holding the yarn in either hand. If she feels better holding it in the left, teach her Continental. Teach English/throw-pick if she holds it in her right hand.
Some people in the past have thought that left handed people would need to either get special left handed patterns or go through the process of trying to read a "right handed" pattern backwards. This is totally unnecessary. Don't make it more complicated. :??
Show her the videos here for both continental and english knitting. With some practice, she will find which one feels more natural to her.
BTW, I knit continental and I am left handed. I like the yarn in my left hand because I can control my tension better that way. :eyebrow:
Good luck and enjoy the time you get to spend together. cloud9