Erva Belle Nichols Cowden was born in 1861.

Erva Belle Nichols Cowden was the daughter of Charles Marion and Mary Catherine Cross Nichols. Her brothers William and John N are also buried in Mound Cemetery.

From the 1900 Village of Cowden, Shelby County, Illinois census record I can see that Erva Belle, nee Nichols, Cowden, was born in December of 1861 in Illinois.

Erva Belle, nee Nichols, Cowden and her husband and family are on lines 85-90 of that 1900 Village of Cowden, Shelby County, Illinois census record.

Erva Belle Nichols married George Harrison Cowden on January 20, 1883 in Cowden, Shelby County, Illinois.

Erva and George Cowden had six children.

The children's names were Orval, Lottae, Ancil Edward, Mabel Arrena, Lenora Ernestine, and Mary Kathleen.

Orval and Lottae didn't live more than 3 years.

Ancil Edward Cowden died at about the age of 25 years old in Hot Springs, Arkansas in January of 1913.

I found that Mary Kathleen Cowden had married a man named Edwin Fell Graham and here's a link to a Find-A-Grave website page for Kathleen M., nee Cowden, Graham:

https://www.findagrave.com/memorial/137164250/kathleen-m-graham

Apparently Mary Kathleen liked her middle name more than her first name and switched her name around later in life.

Lenora Ernestine Cowden married a man named Charles Andrew Blume. Lenora Blume died in October 1974 in Madison County, Illinois. Charles Blume died in April 1983 in Madison County, Illinois.

Lenora Ernestine, nee Cowden, Blume and Charles Andrew Blume are both buried in the Sunset Hill Cemetery, which is located in Glen Carbon, Madison County, Illinois.

After George Cowden's death in 1911 Erva Belle Nichols Cowden married David M. Duddlesten in December of 1912 in Douglas County, Illinois.

I found a 1930 census record for Stewardson, Shelby County, Illinois showing a David M. Duddlesten and his wife Erva Belle Duddlesten.∼Married David M. Duddlesten after husband died.