Then, was it premeditated, or spur of the moment? Her pace doesn't drop at all when she got in the car, which suggests she didn't have to wait, she hopped straight into one from her running pace. Which means someone was probably waiting and knew they had to keep moving quickly.
I reckon she phoned someone, said she was struggling and planned it, hoping she'd get away with it, based on the fact she's a world record holder and usually finishes strong. I can't imagine her brain is functioning properly at mile 40 of an ultra, I could barely say my name after a marathon, so it's unlikely she really considered this in any serious way.