Derek ... Given these possible references did she marry Blackman, Eason then Holland ? I'm guessing that you have all the other sources that are on familysearch ? JUst a thought ....
"United States Census, 1910," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MLS4-Y8H : accessed 5 January 2018), John W Blackman, Selma, Johnston, North Carolina, United States; citing enumeration district (ED) ED 56, sheet 27A, family 517, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1119; FHL microfilm 1,375,132.
"United States Census, 1930," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:X33P-R3K : accessed 5 January 2018), Martha Holland, Pleasant Grove, Johnston, North Carolina, United States; citing enumeration district (ED) ED 31, sheet 2B, line 51, family 24, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1701; FHL microfilm 2,341,435.