Well, this one might be a stumper. I have a student named Nancy Bryant attending the Mordecai school for one semester, the first half of 1810. No hometown, no adult's name, in my dissertation's appendix. Just a name and a date. And the name is both fairly common, and subject to multiple variations (Nancy as a nickname for Ann(e); Bryant and Bryan are names that turn up interchangeable in Southern family history records). She seems not to have been mentioned by the Mordecais in correspondence, and may only have appeared the one time, in the student register.
This one will have to await further information from interested contributors.