What struck me is the lack of a particular detail that she provided in her previous media interviews: that they stopped at least twice to "move boulders off of the road."

That is what we call a "clue."

Her "official" statements also point out the dangers of cultural conditioning. They "expected" the roads to be plowed, because their previous experiences in heavily-traveled ski areas led them to conclude that they would be. They "expected" someone to come along and check the gates, because their previous experience in heavily used camping areas led them to conclude that they would be.

Assuming that things in an unknown area will be the same as those in a known area is dangerous.