 She attended the University of Lausanne in Switzerland.Given the close relationship between Barry Levinson and David Mamet, who had been hired to rewrite Henkin's screenplay for "Wag the Dog" after Levinson became attached as director, New Line Cinema originally asked that Mamet be given sole screenplay credit; but the Writers Guild of America intervened on Henkin's behalf to ensure that Henkin received first-position shared screenplay credit as the original screenwriter and creator of its structure, which she loosely adapted from Larry Beinhart's novel "American Hero", as well as much of the story and dialogue.Other produced screenplays include "V for Vendetta" (2006) (uncredited), "Romeo Is Bleeding" (1993), "Road House" (1989), "Lost Angels" (1989) (uncredited), "Fatal Beauty" (1987), "Flowers in the Attic" (1987), "Blue Heaven" (1985), "Prisoners" (1981), and "Headin' for Broadway" (1980).