According to her obituary, she died of typhoid fever.
Jordan, John W. Genealogical and Personal History of Western Pennsylvania|Genealogical and Personal History of Western Pennsylvania, Vol. 2 (Lewis Historical Pub. Co., New York, 1915, p. 874-5)
Ancestry.com, including
Find A Grave: Memorial #102498056 - Pleasant Grove Presbyterian Cemetery in Cook Township, Westmoreland County, Pennsylvania -- A copy of her obituary is posted on her FAG profile.
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