The profile of this family in the Elliott County History says that Elijah died 20 Jun 1919 and that his second wife Susan Dehart died 9 Jun 1927. Their gravestones as surveyed by the Rowan County Historical Society have those death dates reversed.

His death certificate records Elijah Green Caudell, age 82 years 5 months 7 days, born 3 Dec 1844, birthplace unknown, died 10 June 1927 in Martinsburg, Elliott Co., Kentucky, father Leck Caudell, cause of death infirmities of age, informant Alvin Caudell, Big Stoke, burial in Brown Grave Yard.

I cannot find her in the Kentucky death records. The date of death is from her gravestone.

1910 census of Elliott Co., Ky, Martinsburg precinct, enumerated 23 April, lists on p. 5B as family #79/82:
Caudill, Elijah G., 68, farmer, b. Ky Georgia Ky, 2nd marriage; Susan, wife, 64, first marriage, married 25 years, mother of 1 child, 1 living, b. Ky Va Ky; Alvin J., son, 23, b. Ky Ky Ky; Dehart, Elijah, nephew, 17, b. Ky Ky Ky, farm laborer.

Elijah Dehart is the son of Susan’s brother Allen Dehart and his wife Susan Cline.