Could one of these be her?
"United States Census, 1860", database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MCQ8-M8F : 30 December 2015), Mary Moran in entry for Hubert Moran, 1860.
"United States Census, 1850," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MCBW-HDK : 9 November 2014), Mary Moran in household of Michael Moran, New York City, ward 9, New York, New York, United States; citing family 694, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).