The Academie, by Susanne Dunlap

YA hist fic, set at a boarding school in Saint Germain where Hortense de Beauharnaise (Josephine Bonaparte's daughter), Caroline Bonaparte (Napoleon's daughter), and Eliza Monroe (daughter of the future US president all actually attended.
The writer changed their ages a bit, and of course they went to masked balls and all sorts of silliness, but it was a fun and quick read.