BARRETT, Sarah, d. Benjamin and Sarah, [born] Oct. 17, 1788.
↑ In 1832, a petition regarding the estate of brother Joseph is signed by one Sarah Barrett, with the explicit indication that that is the mother. Assuming it is all the heirs as it implies, and should be, this seems to indicate the sister Sarah had died by then, though the details of her death, or whether she was married or single, are unknown.