According to the 1900 census for Concord, Iroquois, IL she was b. in OH in Dec 1852 and they were married abt 1882.
In the 1880 census for Concord, Iroquois, IL there's a Julia CARRELL, age 27, b. OH, listed as sister-in-law in the household of John and Nancy E. CROUCH, both b. OH.
I think a possible match is this family in 1860 in Coshocton Co, OH: CARROLL, John age 41 b. OH Cordelia age 31 b. OH Owen S. age 6 b. OH Ivery age 3 b. OH John S. age 2 b. OH Louisa age 11 b. OH Julia A. age 9 b. OH Tobitha age 15 b. OH Jane age 13 b. OH Nancy Ellen age 18 b. OH
In the 1880 census there was a 9 yr age difference between Nancy E. CROUCH and her sister Julia CARRELL.
In 1850, Jackson, Coshocton, OH: CARROLL, John age 27 Jane age 27 Nancy age 7 Tabitha age 6 Elizabeth age 4 Louisa age 1
The questions that arise if this is your Julia's family are when did Jane die, when did John marry Cordelia and which one of the wives was Julia's mother?