United Kingdom, Jan. 25 -- Amber Heard has "lost [her] ability to speak" in the wake of her legal battle with Johnny Depp.

The Aquaman and the Lost Kingdom actress has made a surprise appearance in Silenced, a documentary about accused men using defamation lawsuits to silence women speaking out about abuse, and she claimed she no longer wants to tell her own "story" about her marriage to the Pirates of the Caribbean actor.

In a confessional interview for Silenced - which has premiered at the Sundance Film Festival - with director Selina Miles, Amber said: "This is not about me. I have lost my ability to speak. I am not here to tell my story. I don't want to tell my story. In fact, I don't want to use my voice anymore. That's the problem...