There was an Ellen Cantrell b. NC about 1840, who lived in GA during the 1870 US Census.
Another Ellen Cantrell, was b. GA about 1867 and 3 years old living in GA during the 1870 US Census. Her father was Rudy Cantrell, age 28 and mother was Mary, 29.
Her 11 yr. old brother was Thomas, 9 yr old sister was Jesse. It looks like she had a twin sister Eva and a younger brother, Lewis D., 1 yr old.