Really sad. Obviously not enough water; 24x16oz of water in that locale is a good start for a day, for one person. She probably presumed that they'd arrive and she didn't anticipate any issues. You just can't have too much water. Heck, I take that much water on a drive up I-5.
As has been noted, 4x4's are part of the problem, folks seem to be more careful with 2WD.
The family's pet dachshund survived the ordeal and was being cared for by San Bernardino County sheriff's deputies, said Sgt. Tim Lotspeich, a deputy who assisted in the rescue. . .