I don't feel bad for her, it's part of learning how to race these races. If you miss a bit, go back and do it all, end of.
She missed multiple bits, so is clearly shit at navigating, and like has been said before, it's more than what you've got in your legs.
If you're unsure of the route, plan for it, pore over it in every detail, make your own route files with cue points that will work on your garmin so that you know how far the next turn is, how far the next town is, etc etc. I must have spent dozens of hours doing this for Tour Divide, I had zero navigational issues. I had 2 garmins and back up paper maps. One turn every 30 miles is hardly rocket science either when you're used to densely populate Europe.