>>Something doesn’t sound right here.
What exactly? A 53 yo exerting herself in 115 degree temperature is a risky move for a young and healthy person never mind an older person.
The fact that not one person in the group (what kind of group was this?, any experienced hikers or was this just a group of ordinary, non-hiking folk?), knew how to deal with it, let alone prevent it. Why couldn’t they reach her until the next day?
My mentor was a geology professor from Rutgers. He mentioned to me that every year he took his top geology student to the Grand Canyon, and travel down it by mule. Many times even the fittest would suffer heat exhaustion.