Get her to carry a phone and use find my friends to keep track of her. It’ll allow you to know where sh is on the track, if she’s stopped moving, and when she’s coming back into the pits. All this info is valuable for you and her.
DFL beats DNF, every day of the week.
If she’s put in the training, using the food she’s going to use in the race, and including some long rides, all else should be ok. The food/training info should track amounts of food required to stay comfortable? Not sure how to explain this last bit, but as a type 1 diabetic I had to nail this element. I monitored my blood glucose while training to work out how much food I needed to maintain my BG level. 1 Gu every 1.5 hours, 2 scoops of Tailwind per hour, for me.
Relax. Enjoy the challenge.