I don't know if you need info on Mary Elizabeth Dodd, but I found that she was the daughter of Elisha Dodd and Louisa [unknown]. She is found on the 1870 census in Farmerville. The family name is spelled "Dord". She is also listed on the 1880 census along with a step-brother and 5 other siblings.
I found Elisha Dodd on the 1860 census. His mother was Malinda [bn ca 1810 TN] and his father is apparently deceased. Two siblings are Wesley  and M.M. [16 female]. Elisha is 15 and born in LA.
You may already have seen it, but I found a lovely photo of Mary Dodd Howard and William Henyard James Howard on the Union Parish Archives site. There are also a few other photos of the Howards.