Ella plays Cassandra Cain (aka Batgirl) in Birds of Prey, who takes on the evil crime lord, Black Mask, alongside superheroes Black Canary and Huntress, and police detective Renee Montoya. When asked by A Book of Us how she felt about the emergence of female superheroes in film and TV, Ella said it should have happened a long time ago, but she is thrilled to see it happening now. "Little girls should look up to strong women and see that they can be a superhero, too," she said. "I'm so grateful and happy to be a part of this movement. It was super cool to see my other female castmates in their superhero gear kicking butt."