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- "A pinky swear is forever."
- —Sarah to Clementine.[src]
Nothing is known about Sarah's life before or as the outbreak began.
Sarah is first seen inquiring about the ensuing chaos outside the cabin surrounding a mysterious bitten girl, Clementine, who was found in the forest. Her father strictly tells her to return to the inside of the house, to which she does.
Sarah's next appearance is after she is discovered by Clementine, who had been searching the house for hydrogen peroxide to disinfect her dog bite. After Clementine enters her bedroom, Sarah is initially reluctant to offer the medication at the risk of getting in trouble from her father. Despite this, she complies to Clementine's request after seeing a chance of friendship in Clementine. She is not seen after that, though her father does warn Clementine not to interact with her at the expense of exposing Sarah to the harsh environment of the outside world.