I'm trying to find a french ancestor, described as "the aimable daughter of Dieudonne des las Cases" (in a history of Philadelphia, of all places). She was born around 1779 based on her death certificate, probably in France or Saint-Domingue. Her name is listed some places as Acelie, others as Cecile. (Ce and A in cursive look a lot alike, so it could just be a misreading). Based on marriage and death papers of her kids, her maiden name could be Faure, Fanne, or Ford. She married Victor Guillou in Saint-Domingue/Haiti in 1796. Any suggestions as to how to investigate this?