Most media reports I've seen state that the mom was found less than 100 feet away from her husband. If she were truly racing to get help, she would have made it a lot farther than that.
I have no idea what happened, but I think the most plausible scenario is that someone in the family was in distress and they all stopped for an extended period of time. Everyone's condition then worsened while baking in the sun. At some point--perhaps several hours later--the wife was the only one of the two adults who was still conscious. In an extremely weakened state, she tried to hike up trail but collapsed after a few seconds of effort.
Again, I don't know what happened, but the fact that the wife only made it a few feet up the trail suggests that she was already extremely compromised by the time she decided to try to go for help.
I agree.
My theory (subject to change as more evidence comes in,) is that the husband was in distress. I think that if the baby had been, they’d have kept going to get help.
So, I think it’s likely that the husband settled down to rest and she waited with him. It’s very common for people to not realize that they can’t ‘rest and drink water’ to recover from serious heat stroke.
Then she gets worse, her thinking is impaired from the heat, and by the time she realizes that she MUST go on and try to get help, it’s too late for her to go far.