Per the following sources, it appears that Nancy Allie Farrah Welch is buried at Zavalla Cemetery, Angelina Co., TX
Source:
Angelina County, Texas Cemetery Records, Vol. 1 1846-1968 and Vol. 2 1969-1981 page 23 - Duncan (Dunkin) Cemetery
Emmett Payton Dunkin (2nd spouse of Nancy Allie Farrah Welch) is buried at Duncan Cemetery
Angelina County, Texas Cemetery Records, Vol. 111, 1980-1986 p. 49 - Mrs. Allie Dunkin - buried at Zavalla Cemetery
d/ 2 Aug 1986 (age 91)