I am not a cross countrier, but I do heavy cardio workout (which is not recommended by Mark, but it works for me). 1.5 hours a day of stairmaster/crosstrainer at high intensity, and I can say that the switch to Primal was not hard at all for me. I am not low carb, I'm high on starchy vegetables, probably 150-200g a day, and lower fat and protein, and I see no change in my energy levels. Everyone is different, though, I'd advise your daughter to try it for herself first, but there can't be too much harm in eating natural, unprocessed foods.
F 28/5'4/100 lbs
"I'm not a psychopath, I'm a high-functioning sociopath; do your research."