The 24-year-old has been in rehab at the Betty Ford Clinic, where a judge ordered her to stay until January 3.
But her time in the treatment centre may cost her some work.
The director of the upcoming movie is open to the the possibility of recasting her starring role, in which she plays porn star Linda Lovelace.
Director Matthew Wilder told RadarOnline: 'You know we have been through a lot with this project, and although she is still our number one choice, we do have a Plan B if she cannot film Inferno.'