Not sure - marriage records are not necessarily easy to come by.
PRESUMING THAT SHE STAYED IN THE SAME TOWN (Newton, Mississippi)...
I took a look for all Frances E (blank last name) with the same general birth date and birth place. There were a few possibilities:
For 1900 - there were 4 matches - all were race of "Black" - no not a match.
For 1910 (and I stopped looking after this):
"United States Census, 1910," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MPDZ-9DD : accessed 25 September 2017), Frances A Gardner in household of Samuel P Gardner, Beat 1, Newton, Mississippi, United States; citing enumeration district (ED) ED 85, sheet 16A, family 228, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 753; FHL microfilm 1,374,766.
This one is close, but the birth date is off a bit. Normally most women on the census seem to fudge their age to make themselves slightly younger, but this one is slightly older. I'd think this one is unlikely. Plus there are slight discrepancies in the parents place of birth as well.
So either she married and moved away (at least a little), or she could have passed away between 1880 and 1900. Or a number of other possibilities, but I wasn't able to find a marriage just by this search.
