IMO from the Pic, ED returned to the Cabane de Besurtas, exactly as she had done the day before. She'd have climbed up to the PdelaG the next day, arriving at dusk. This comports with LE's statement that there was no evidence ED had ever been to the RdeV (though by the time LE checked it, it almost certainly had become contaminated). It also jibes with the order of the trip she outlined to DC. First on that list was PdelaG. IMO it was a longer and more difficult trail than she anticipated, she reached there in dying light, and did not plan on the dangerously steep scree slope extending beneath her feet at the PdelaG. As I mentioned upthread, the vast majority of mountain accidents are on the descent. This would exactly be the case in this scenario—topped off with fatigue, sore muscles, likely dehydration, chill as the sun lowered and as the base layer became damp with sweat from the exertion, damp turning to a thin layer of ice on the surface of everything... Recipe for catastrophe.