From NKAA, Notable Kentucky African Americans Database (main entry)
Hamner, Margaret C. "Maggie"
(born: 1854 - died: December 11, 1899)Margaret Hamner was the head cook at the Kentucky Governor's Mansion for 16 years. She served four Democratic governors, having arrived with Governor Luke P. Blackburn, 1879-1883. She next served Governor James Proctor Knott, 1883-1887; Governor Simon Bolivar Buckner, 1887-1891; and Governor John Young Brown, Sr., 1891-1895.
Margaret Hamner was dismissed when Governor William O'Connell Bradley was elected in 1895. Margaret's husband Bob died in 1897, and she was cooking for a Mrs. Marshall until her health fail and she moved to Louisville where she died in 1899. She had been living at 612 Rear Oak, according to the Kentucky Death Records [Ancestry]. She was buried in the Cave Hill Cemetery.
For more see "Cooked for governors," The Louisville Courier-Journal, 12/13/1899, p.6 [name spelled "Hanmer"].