Individual found on the 1800 census for Lancaster, Butler Co, PA as wife to James S. Taggart. Also in household were C.E. Johnston, female-age 20, F.E. Kentnman, female-age 10, J.W. Emery, male-age 19, and Margarat Ruby, female-age 76, listed as mother-in-law to James Taggart. The children are all listed as step daughters or son to James Taggart.
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Regarding the reported burial place for Mary at Mount Nebo Cemetery in Whitestown, PA:

Whitestown is a populated place located within the Township of Connoquenessing, a minor civil division (MCD) of Butler County.4713

There are several Mount Nebo cemeteries listed on FindaGrave in Pennsylvania. Only one of them is in Butler County, but I’m unable to find a memorial for Mary there.4714