Okay, guess I'll answer from a woman who just learned to snowboard this past year. I suggest a butt pad for the falls, it really helped, also I had wrist guards after my first fall on my wrist and that helped. I also had knee pads for the first few times learning. The padding made a hell of a difference and I recommend to anyone learning.
I, however, didn't take lessons. Being an "older" snowboarder I wanted to learn at my own pace rather than feel inadequate with a group of teenagers and 20 year olds. So, the internet was my teacher. I watched several "learning to snowboard" videos on YouTube. I then spent a few hours the prior day watching people learning in a few group classes. I was a skier so I would head to the bunny slopes and then watch some of the classes and then go back to the condo, trade my skis for the snowboard, and head to the hill with my husband. He is also "self taught" and he really just let me learn on my own and encouraged every good move or fall I made. You can even hear him on the video saying I almost have it - when obviously I didn't! lol But being an "older" learner after two hours I had had enough so it took me about 4 weekends before I felt comfortable enough to get off the bunny slope.
If she can stand learning for 8 hours on the hill - they she will learn a lot quicker than I did, but after 2 hours that was my limit each day.
Here is the video my husband made of me learning, yes the falls were not fun, but I am soooo glad I kept at it and love it!!!
vicki learning to snowboard at 50 - YouTube
Good luck and hope she likes it!