Might be this Mary Lou van Hook, wife of John D? From https://familysearch.org/
Appears from her year of birth and the 1860 census, she may have been his 2nd wife?
https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3A%22mary%20l%22~%20%2Bsurname%3A%22van%20hook%22~%20%2Bresidence_place%3Atn%20%2Bresidence_year%3A1900-1915~
U S Census, 1900 ED 4 Civil District 4, Cheatham, TN
Mary Lou Vanhook
birth:Dec 1844 TN
spouse: John D Vanhook
Census, 1910 Civil District 5, Cheatham, Tennessee
SELF William E Allen M 46y TN
WIFE M Z Allen F 42y TN
SON Charlie Allen M 17y TN
SON Georgia Allen M 12y TN
SON John Allen M 10y TN
SON Gilbert Allen M 2y TN
BRO H R Allen M 50y TN
Fath in law John D Vanhook M 78y TN
Moth in law Mary Vanhook F 66y TN
U S Census, 1880 Civil District 5, Cheatham, TN
SELF J. B. Vanhook M 47 TN married
Other M. L. Vanhook F 35 TN single abt 1845
C. J. Vanhook F 18 TN
M. T. Vanhook F 15 TN
M. Z. Vanhook F 13 TN (Maranda Z)
D. W. Vanhook M 7 TN
US Census, 1870 Cheatham District 05 TN
J D Vanhook M 36y TN
Mary Vanhook F 25y TN
Calvina J Vanhook F 8y TN
Mary T Vanhook F 6y TN
Maranda Vanhook F 3y TN
1860 Census Cheatham, Tennessee
J D Vanhook
Age 28 years TN
Family Number: 329
F E Vanhook Female
Age 1 year
Birth 1859 TN
Family Number: 329