Note: Barbara, who loved and knew Mary as 'Maw' and is in the linage as my Mother, sent me information stating that Mary's father was born in 1850, not 1851, but kept the death date as 1911.
She referenced:
Francis M Hopper , 1850-1911, with # LK4B-588

She listed Mary's Mother as Sarah Ann Cowan,
1851-1897, and gave # L5VV-DF9

It is my assumption these are familysearch dot org numbers but I haven't yet verified as Barbara certainly knows her family lore and actively interacted with Mary, learning from her.

I take her accounts as true and accurate as she would be someone who would have personally interacted with and knew these facts.

**********************
Mary E Hopper

Event Type Census
Event Year 1900
Event Place Magisterial District 3, Sharp,
Calvert City Precinct, Calvert Village,
Marshall, Kentucky, United States
Gender Female
Age 14
Marital Status Single
Race White
Relationship Daughter
Birth Date Jul 1886
Birthplace Kentucky
Father's BP Kentucky
Mother's BP Tennessee

Francis M Hopper Head M 49 Kentucky
Zadia B Hopper Wife F 31 Kentucky
Alexander Hopper Son M 21 Kentucky
William H Hopper Son M 16 Kentucky
**Mary E Hopper** Dau F 14 Kentucky
Eli Hopper Son M 11 Kentucky
Fulton Hopper Son M 9 Kentucky
Raymon Hopper Son M 2 Kentucky
Nettie Fuknway Stepdau F 8 Kentucky

"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9HC-37H : accessed 24 February 2016), Mary E Hopper in household of Francis M Hopper, Magisterial District 3, Sharp, Calvert City Precinct Calvert City village, Marshall, Kentucky, United States; citing sheet 5B, family 104, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,542.
*****************************

Mary Hopper

Birth Date 1885
Age 18
Spouse Name J.F. Keeling
Spouse BD 1883
Age 20
Event Date 16 Oct 1903
Event Place Marshall, Kentucky
Father's Name F.M. Hopper
Spouse's Father Alex Keeling
Spouse's Mother Mary Holyfield

"Kentucky Marriages, 1785-1979," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4SV-FSF : accessed 24 February 2016), J.F. Keeling and Mary Hopper, 16 Oct 1903; citing Marshall, Kentucky, reference 291; FHL microfilm 1,760,357.
****************************