Some of the students on the roster don't have much detail to work from. The fourth name, Susan Adams, is one of the sketchier figures. What we know: Susan Adams was enrolled at the Mordecai school for two terms in 1811; the name "Dr. Robert Moore" is attached to her account, and the town of Hicksford VA may be related to her as well.
Hicksford is in Greensville County, Virginia, a little north of the North Carolina border. It's now called Emporia, but there's still a Hicksford Avenue and Hicksford Historic District there.
Checking with the genealogical resources online: There was a Susan Adams born to Jeremiah Adams and Elizabeth Grigg of Bedford Co. VA, sometime after 1798 (both parents were born in 1776 in Virginia, and Elizabeth was born in Hicksford). That Susan was one of ten children. A bit slim a connection, though, for such a common name. So Susan Adams may not be someone we can track down definitively, at this point. But she was a Mordecai student in 1811, so she was probably born around 1800, and she may have had an uncle or guardian named Dr. Robert Moore.