"I'm excited to see what happened to Gloria," she continued about her character.
Fisher also said how she is often mistaken for fellow actress Amy Adams and how one year she decided to poke fun at their similar looks with help from husband Sacha Baron Cohen.
"One year for our holiday greeting card, I cut and pasted Amy Adams' face over mine," the 40-year-old admitted.
"So it was Sacha, Amy and the kids and then we said, 'Season's greetings from Sasha, Isla' — no one noticed."
Fisher and Adams appear together alongside Jake Gyllenhaal in Tom Ford's thriller Nocturnal Animals.
Based on Austin Wright's book Tony and Susan, a trailer for the film follows Adams and Gyllenhaal as lovers who find themselves caught up in a dark and twisted revenge plot.