She is married to William Murphy Boatman.
They got married on March 18, 1836 at Grainger County, Tennessee, Verenigde Staten, she was 19 years old.Source 3
Headstone for Elizabeth Cox Boatman
http://trees.ancestry.com/rd?f=image&guid=7a6e68fd-6f81-4a4d-b97e-987cf72da729&tid=4883085&pid=102
Birth date: abt 1818 Birth place: Tennessee Residence date: 1880 Residence place: Fourche, Pulaski, Arkansas, United States/ Ancestry.com
Marriage date: 18 Mar 1836 Marriage place: Jefferson Residence date: Residence place: Tennessee/ Ancestry.com
Birth date: abt 1817 Birth place: Tennessee Residence date: 1870 Residence place: District 2, Jefferson, Tennessee, United States/ Ancestry.com