Studio execs slam 'difficult' Katherine Heigl Nancy Heigl and daughter Katherine Heigl (R). Both mother and daughter have been said to be 'difficult' on set. KATHERINE Heigl may have netted millions for her films but she isn't winning many friends with her rumoured "difficult" on set behaviour. "She can cost you time every single day of shooting," a source, who worked with her on the film Life as We Know It told The Hollywood Reporter, describing "desperately difficult situations" on set. Wardrobe issues, not getting out of the trailer, questioning the script every single day... A TV network executive told the magazine that Heigl was passed up for the lead in a potential new television series because of her reputation. "On many levels, she would have been perfect for the role, but all of us said, 'She's not worth it,'" the insider said. In the past, Heigl has publicly slammed her own projects, which has damaged her relationships with directors and co-stars. She called Judd Apatow's Knocked Up "sexist," stating that it was "hard for (her) to make." She then incurred the wrath of TV behemoth Shonda Rhimes by saying the writing on Grey's Anatomy was basically rubbish. Not surprisingly, Heigl departed the show soon after. Then there's the equally difficult reputation of her mother/manager Nancy Heigl. "I have never experienced anything like Nancy Heigl," an anonymous movie exec told The Hollywood Reporter. It's about the mouth. F**k you. You are a f***ing liar. Whatever you'd say, you were an idiot. You knew that every day you were going to get slammed. Heigl, of course, has often leapt to her mum's defence. "This is a fear-dominated industry," Heigl previously told Vanity Fair. And my mother refuses to be intimidated by that. This is all a game of chicken and my mother is really good at chicken.