1878
Mattie Cook was born in Feb 1878 in South Carolina, USA a child of William Cook and Carrie Cook.
1880
Mattie Cook was counted in the census on 23 Jun 1880 in Wateree, Kershaw, South Carolina, USA, as a 3-year-old, female, single, white, daughter. Also in the home were; her father, William Cook; her mother Carry Cook; and her siblings, Annie Cook, Elizabeth Cook, and Belton Cook.
1896
When she was 17, she married William H Hornsby, son of Edward Joseph Hornsby and Francis Albert Hornsby, in 1896.
1900
Mattie Hornsly was counted in the census on 13 Jun 1900 in Ridgeway, Fairfield, South Carolina, USA, as a 22-year-old, female, married, white, wife. Also in the home were; her husband, William Hornsly; her mother-in-law, Fannie Hornsley; her sister-in-law, Mattie Hornsly; and her brother-in-law, Dick Hornsly.
1910
Mattie Hornsby was counted in the census on 05 May 1910 in Flat Rock, Kershaw, South Carolina, USA, as a 28-year-old, female, married, white, wife. Also in the home were; William H Hornsby; and their children, Almend Hornsby, Jesse Hornsby, Carrie Hornsby, and Joseph Hornsby.
1915
She died on 28 Jul 1915 in Wateree, Kershaw, South Carolina, USA. She was buried on 29 Jul 1915 in Elgin, Kershaw, South Carolina, USA at Union Baptist Church. Her cause of death was Pellagra.

1917
On September 2, 1917, Mattie Cook was mentioned as the mother in the death record of Jessie Hormsby.
1996
On January 27, 1996, Mattie Cook Hornsby was mentioned as the mother in the death record of Mrs Almeade Hornsby Trapp.