Final answer:
The provided excerpts do not directly answer how Phoebe marked her route when looking for George. They, however, illustrate how a similar character used simple markers like a house of stones, a corral of pebbles, and pictures in the dust to leave a trail.
Step-by-step explanation:
The question revolves around a scene where Phoebe marked her route when searching for George.
From the given excerpts, there is no direct information stating how Phoebe marked her route.
However, if Phoebe is indeed one of the characters from the excerpts, and considering the question in the context of those passages, it is possible to deduce ways similar characters left traces or markers.
For example, in one of the excerpts, Lassiter reads little Fay's trail, pointing out the small markers and signs she left behind, such as a house of stones and sticks, a corral of pebbles, and pictures drawn in the dust.
These examples illustrate ways in which characters within the text might mark their passage through a space, though it's not specific to Phoebe's actions.