The Blue Mountains presented the most severe physical challenge of the journey.

The mountains rise to elevations of more than 8,000 feet in places, and in January of a Pleistocene-climate year, the snow depths would have been substantial.

The accounts mention nine days of particularly severe travel through snow drifts before she built a more substantial shelter.

The shelter-building period is described in most accounts as a stopping point while conditions were too severe for continued movement.

She built a rough structure, used the hides she had brought as shelter material, and kept the children sheltered while managing her own need for warmth and the ongoing challenge of finding food.