British actor and Sons Of Anarchy star Charlie Hunnam, who plays her love interest in the film, praised the 28-year-old's impressive work ethic.
"She was shooting three or four films simultaneously while we shot this movie and I was struggling just to keep up with one job at a time, so I can't even imagine the discipline and the work ethic that she must have," he said at the film's Los Angeles premiere.
"She lives in a world of her own making but I don't envy it at all," Charlie said.
"She's one of the most hard-working people I've met in Hollywood, which is full of thousands of competing workaholics. She's a real joy, and I enjoyed working with her a lot."
Charlie worked pretty hard himself to prepare for the role of former boxer and ex-prisoner Jay in Deadfall, which also stars Eric Bana.
"I trained every day for five weeks leading up to this film, almost as if I was training for a fight," he revealed.
"I would get up at five in the morning and run five miles, eat oatmeal and egg whites, box in the gym for two hours, then watch fights all afternoon before going for a swim. That's the wacky thing I did to get ready."