What Became of Mary Bartley?

    David Bartley and his first wife, Margaret Burnes, had four children, the first born in Ireland, the others in New York City. John died, unmarried, at 26 years of age in 1867 and was buried in Calvary Cemetery in Woodside, Queens County, New York. Both Robert (born in 1843) and David (born in 1845) married and had children. They have living descendants and their lives and families are well documented. 
    The fourth child, Mary Bartley (born circa 1846) was enumerated in her parents’ household in 1850, 1855 and 1860. She was not buried in either of her father’s two plots in Calvary Cemetery, so it is likely she married, rather than died, before the 1870 census.
    Robert’s daughter, the writer’s grandmother, often talked about her uncle David, but she never mentioned John and Mary. Since John died eight years before she was born, it would not be surprising had she not known of his existence.  But what about Mary?

1860 NYC, Ward 4, p. 776, dw 22, fam 294, David Battel [sic]; Ancestry.com

   According to the 1860 census, Mary’s middle name was Jane; however, that added clue hasn’t helped the writer locate her.