I was not able to come to a definite conclusion about your Susan Ellen.My best guess at this point would be she was the daughter of Elias & Theresa (Trussel) Brigance.Theresa probably died by 1880 as she is not listed with the family in the 1880 Brazora Co., TX Census.Elias had at least three children, but only two are listed with him in the 1880 Census.Neither were named Susan Ellen. One was a Katie E. (?). Elias's oldest daughter (Mary Ann) married James Douglas Hanson/O'Hanson. Are you familiar with the name Hanson/O'Hanson? Elias's father was Charles Newton Brigance and he named his son (born in 1872) Charles Newton.Is Charles Newton a family name in your line. Let me know if you get any more clues or think I might be of assistance.