There is a student named Nancy Franklin in the roster of Mordecai school students in my 1996 dissertation. It says she was at the school in 1814.
I suspect she might be this Nancy Franklin: Ann P. Franklin (1795-1874), daughter of Jesse Franklin and Maria Perkins Franklin. Jesse Franklin was governor of North Carolina from 1820 to 1821. When Nancy was at school, Jesse Franklin had just finished a term in the United States Senate. She married William Slade in Surry County, NC, in 1821? That's a perfect year for an 1814 student to be marrying, in North Carolina. She was later known as Nancy P. Slade, lived in Rockingham till at least 1870, and had at least five children. Her husband William Slade died in 1865. (1850, 1860, 1870 censuses, via Ancestry)
Besides the good timing, there was also a student named Helen B. Slade at the Mordecai school, also in 1814, and also from Rockingham. So if Mrs. Slade is, indeed, the Mordecai student Nancy Franklin, she married into a classmate's family, which is pretty typical.
If we have the right Nancy Franklin, one of her sons, Jesse Franklin Slade, died at the Battle of Gettysburg during the American Civil War. Her two daughters died before that, both in their 20s. And two of her sons survived her, Thomas Howard Slade and William B. Slade.
And if this is the right Nancy Franklin, here's her grave in Caswell County, North Carolina.
