The actress, who starred as twin sisters Goldie and Wendy, suggested that creative differences between the studio and the filmmakers had postponed production.
"I think when Sin City came out it was such a big hit for the studio but the studio is frustrating…sometimes studios are awesome because they have a great vision for something, but then they want to do weird things with the second one," she told Collider.
"[Director] Robert [Rodriguez] didn’t want to go down that route, so we’ve just been waiting till somebody knocked some sense into them, where we can do it the way we want to do it.
"None of the filmmakers or the actors were willing to sacrifice doing it any other way other than what we wanted to do it. I’m hoping we’ll do it sometime this year, but you know how movies are."
Earlier this month, Frank Miller announced that he had finished writing the script for Sin City 2 but said that casting had not yet started.