mohican trail 100 mile run

My wife has been training for this race since last year. Last year, she decided late in the game to attempt to run the Mohican Trail 100 mile race. She only made 60 miles in that attempt. When you can put "only" and "60 miles" in the same sentence, you either have lofty goals or insanity runs in your family.

My wife, Shelia Allen is in training to run the Mohican Trail 100-mile race June 16-17 near Loudonville, Ohio. Yes, I said 100 miles. On foot. With a 32-hour time limit. The terrain is hilly, with treacherous footing chock full of roots and rocks. I am planning to pace her through the last 40 miles. How does one get ready to cover 100 miles on foot in a little over a day?