I can't get my head around this. The picture on GoFundMe shows what looks like very intelligent, well-functioning people. I'm not any good at judging ages, but I would guess the age of the boy at 8-10. I did not know that you can die of heat stroke days after you were rescued, another yawning gap in my thin knowledge of medical issues. And why transport her to a Lake Arrowhead hospital? Surely the experts on treating heat stroke are in Coachella Valley hospitals.
I would have guessed that you can make a phone call from most places on Skyline, but my only experience is calling from Flat Rock and the Never Ending Ridge. Much of the material for the article seems to come from a relative. Relatives often refer to the subjects as 'experienced hikers', but that is quite a broad spectrum. Skyline in the summer is for people like bluerail at their peak, who are off the charts, not merely experienced hikers. As for checking conditions, the only condition you had to check was the calendar: it was August.