The 28-year-old star earned an Oscar nomination for her portrayal in David Fincher's English-language adaptation of Stieg Larsson's critically acclaimed novel in 2011, but studio Sony Pictures has yet to move forward with a long-planned follow-up - "The Girl Who Played with Fire", reported Contactmusic.
"I hope that they make the second one. I'm just not sure when they're going to. I mean, I hope they make it soon because I'm not getting any younger. The second one is very physical, so hopefully they'll be making it sooner rather than later," she said.
Sony originally had "Dragon Tattoo" writer Steve Zaillian write the sequel script, but recently hired "Se7en" scribe Andrew Kevin Walker to write a new version.
Both Mara and Craig signed on to star in three movies when they made the 2011 original, but it's not known whether director David Fincher will return to helm the flicks.
Fincher will next direct "Gone Girl", an adaptation of Gillian Flynn's best-selling novel.