Camilla married in DeSoto Parish, LA in 1847 - that is the earliest reference to her found so far.
There is no proof that this lady is a daughter of Robert G. & Mary other than proximity and no other family into which she might fit. Across the state line in Panola TX in the 1850 census is a Dickson Thompson, age 28, b. TN with wife "Caroline", age 24, b. AL. They have two children born in Texas, Augusta A. age 2 and Cornelia age 6 months. They lived next door to Amos Thompson, age 50, and his family. [I think this stands an excellent possibility of being Camilla - perhaps her name was misread in transcribing the marriage record, or the enumerator misunderstood the name Camilla.]
1860 Census. Panola Co TX, Beat 1, Hh 955
1870 Census. Panola Co TX, Beat 4, P.O. Pulaski, p.330, Hh 1748
1880 Census. Panola Co TX, Dist 65, Hh 21
Camilla HADEN and Dickson THOMPSON were married on 22 June 1847 in Desoto Parish, Louisiana.424 Dickson THOMPSON was born in 1822 in Tennessee.