The Call of the Canyon by Zane Grey

Vague sense of movement, of darkness, and of cold attended Carley's consciousness for what seemed endless time.

A fall over rocks and a severe thrust from a sharp branch brought an acute appreciation of her position, if not of her mental state. Night had fallen. The stars were out. She had stumbled over a low ledge. Evidently she had wandered around, dazedly and aimlessly, until brought to her senses by pain. But for a gleam of campfires through the cedars she would have been lost. It did not matter. She was lost, anyhow. What was it that had happened?