In the novel Island of the Blue Dolphins why did karana burn the village of ghalasat down?

One foggy morning Karana decides to leave the village forever. She burns the houses down one by one, and sets out to the place where she has decided to wait for the white men's ship, west of Coral Cove. Here there is a rock upon which Karana can sleep and store food without fear of the wild dogs. Still, the dogs come every night and sit underneath the rock.

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