An interesting comment on Sally comes, as you may recall, from Abigail Adams, who met Sally in London as she accompanied Jefferson's daughter to France (sometime after Jefferson). Adams thought she was an immature teen-aged child, hardly able to act effectively as Miss Jefferson's servant. Sally apparently was given the opportunity for some education during her time in Paris. (That would be consistent with her being Jefferson's wife's half-sister). Those who knew her and knew Jefferson at the time found the notion of an affair (alleged by Callendar) risable.