Elizabeth was born in 1800. She passed away in 1857.
Sources
Census Records:
"United States Census, 1850," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MDZ6-8T8 : 22 December 2020), Elizabeth Miles in household of A P Miles, Macon, Macon, Missouri, United States; citing family , NARA microfilm publication (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (accessed 05 April 2021), memorial page for Elizabeth Anderson Arthur Miles (16 May 1800–24 May 1857), Find A Grave: Memorial #86864279, citing Miles Cemetery, Atlanta, Macon County, Missouri, USA ; Maintained by Farm Girl from Mo. (contributor 47142793) .