Dinitia Smith considers the letters Ginevra King wrote to Fitzgerald. The correspondence has been donated to Princeton’s Fitzgerald collection along with King’s diary and an unpublished short story she wrote.
King is presumed to have served as the model for Isabelle in This Side of Paradise and Daisy in The Great Gatsby. She was “a celebrated Chicago debutante whom Fitzgerald met in 1915 when she was a 16-year-old at the Westover School and he was a 19-year-old at Princeton.”
An interesting side note from the article: “Fitzgerald habitually saved letters and sometimes used material in them for his writing.”