By Ann Hornaday, The Washington Post Since delivering her solemnly impressive feature debut in 2010’s “True Grit,” young actress Hailee Steinfeld has struggled to find a role commensurate with her solid, self-assured gifts. Until now, at least: In “The Edge of Seventeen,” she proves her mettle as that rare performer who can win the audience’s allegiance even when her character is at maximum annoyability. Nadine, the troubled teenager we meet at the precise moment she tells a not-entirely sympathetic history teacher that she’s going to commit suicide, is in many ways a typical high school girl caught up in self-dramatizing angst and perfectly balanced feelings of self-hate and superiority.