Effie -- who accused Hammer of rape last year for an incident that allegedly happened in 2017 -- took to her social media to address the controversial movie that has yet to begin filming.
Universal is reportedly prepping the drama titled She Said to begin filming this summer but it's already catching major backlash.
Hammer's rape accuser addressed the controversy on Wednesday, taking to her Instagram Stories and slamming all those involved with the movie.
Reposting a story announcing Mulligan and Kazan's roles, Effie put in her two cents after an angry Twitter user wrote, "Here's hoping this film hires some of the MANY Weinstein survivors who are still trying to have careers despite Harvey's effort to blacklist us."
The user also begged their followers to help "make this a reality."
Effie shared the user's frustration, adding her own text reading, "Profiting off of survivors' trauma without their consent is exploitation."
"It is not your story to tell," she added.
Effie's outcry comes just one day after it was revealed Hammer checked himself into rehab at an in-patient facility in Florida, outside of Orlando.
According to Vanity Fair, who first broke the news, the Social Network actor entered the facility on May 31 with the help of his estranged wife, Elizabeth Chambers.
The actor has allegedly agreed to stay in the facility as long as needed.
Hammer is reportedly getting help for a number of things, including sex, drugs, and alcohol.
Following the rehab news, Effie took to social media and made it clear she was unimpressed with the actor's decision.
"I feel like this is the right time for me to say that I do not believe in redemption. Or forgiveness. But, I do believe in Karma," she wrote.
In March of this year, she accused the actor of rape.
Effie detailed the alleged violent attack that reportedly occurred in 2017 while sitting next to her powerhouse attorney, Gloria Allred.
“On April 24, 2017, Armie Hammer violently raped me for over four hours in Los Angeles, during which he repeatedly slammed my head against a wall, bruising my face," she recalled.
"He also committed other acts of violence against me to which I did not consent. For example, he beat my feet with a crop so they would hurt with every step I took for the next week," Effie added. "During those four hours I tried to get away, but he wouldn’t let me. I thought that he was going to kill me.”