One source says born 1793 died 1849

https://www.findagrave.com/memorial/65186834/sarah-vanness

Standing Stone Cemetery Records: W/O John H Vanness.

Source: Standing Stone Township Cemetery Listings by Linda English 1992 pg 67: Died Sep 3, 1849 aged 56y 6m.

Sarah “Sally” Dunn Vanness
Birth: Mar 1793 Pennsylvania, USA
Death: 3 Sep 1849 (aged 56) Bradford County, Pennsylvania, USA
Burial: Standing Stone Cemetery, Standing Stone, Bradford County, Pennsylvania, USA
Plot: Original
Memorial #: 65186834
Bio: Standing Stone Cemetery Records: W/O John H Vanness.Source: Standing Stone Township Cemetery Listings by Linda English 1992 pg 67: Died Sep 3, 1849 aged 56y 6m.
Family Members
Spouse
John H Vanness* 1793-1853
Children
Emily Jane Vanness* 1815-1850
Nelson Samuel Vanness* 1817-1897
Mahala Vanness* 1826-1851
Myron Vaness* 1828-1888
Created by: LDR (47171969)
Added: 4 Feb 2011
URL: https://www.findagrave.com/memorial/65186834/sarah-vanness
Citation: Find A Grave, database and images (https://www.findagrave.com : accessed 20 March 2018), memorial page for Sarah “Sally” Dunn Vanness (Mar 1793–3 Sep 1849), Find A Grave Memorial no. 65186834, citing Standing Stone Cemetery, Standing Stone, Bradford County, Pennsylvania, USA ; Maintained by LDR (contributor 47171969) .