I can find no further mention of Mary in Reading or elsewhere. It is possible she was born and died in Charlestown, before her parents moved to Reading. Check the "Tan Books" of Vital Records of Charlestown Massachusetts through the Year 1849.
Sources
Births, marriages, and deaths, 1651-1793: "Massachusetts, Town Clerk...d Town Records, 1626-2001" Catalog: Births, marriages, and deaths, 1651-1793 Births, marriages, and deaths, 1651-1793 Image path: Massachusetts, Town Clerk, Vital and Town Records, 1626-2001 > Middlesex > County records > Births, marriages, deaths 1651-1793 > image 133 of 652; citing Massachusetts Secretary of the Commonwealth, Boston. FamilySearch Image: 3QSQ-G9QY-H3PT (accessed 23 July 2022)
Massachusetts, Town Clerk...d Town Records, 1626-2001: "Massachusetts, Town Clerk...d Town Records, 1626-2001" Catalog: Records of births, marriages, intentions of marriage, and deaths, 1653- 1776, 1640-1846 Records of births, marriages, intentions of marriage, and deaths, 1653- 1776, 1640-1846 Image path: Massachusetts, Town Clerk, Vital and Town Records, 1626-2001 > Middlesex > Reading > Births, marriages, deaths 1640-1846 > image 5 of 145; citing Massachusetts Secretary of the Commonwealth, Boston. FamilySearch Image: 3QS7-L979-3C1V (accessed 23 July 2022)
Massachusetts, Town Clerk...d Town Records, 1626-2001: "Massachusetts, Town Clerk...d Town Records, 1626-2001" Catalog: Records of births, marriages, intentions of marriage, and deaths, 1653- 1776, 1640-1846 Records of births, marriages, intentions of marriage, and deaths, 1653- 1776, 1640-1846 Image path: Massachusetts, Town Clerk, Vital and Town Records, 1626-2001 > Middlesex > Reading > Births, marriages, deaths 1653-1776 > image 130 of 141; citing Massachusetts Secretary of the Commonwealth, Boston. FamilySearch Image: 3QS7-8979-3CP2 (accessed 23 July 2022)
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