"In reality, Amber acted no differently than many victims of domestic violence, who think first of the harm that might come to the abuser, rather than the abuse they have already suffered," Heard's lawyers, Samantha F. Spector and Joseph P. Koenig, said in a statement on Tuesday.
Heard has since given a statement to cops with her recollection of the incident on the night of May 21.
Meanwhile, Depp's lawyer has accused Heard of using the abuse allegations to try to gain an advantage on the actor in divorce proceedings. She is seeking spousal support, but Depp is asking a judge to deny that request.
"Amber is simply a victim of domestic violence, and none of her actions are motivated by money," Heard's lawyers wrote. "Amber is a brave and financially independent woman who is showing the courage of her convictions by doing the right thing against Johnny's relentless army of lawyers and surrogates."
The two met in 2011 on the set of "The Rum Diary" and were married for 15 months.
The actress reported in a court filing that she has about $10,000 a month in income, but her expenses total nearly $44,000 a month.
Depp is traveling overseas on tour with his band, Hollywood Vampires. His latest film, "Alice Through the Looking Glass" bombed at the box office, earning just over $28.1 million in its opening weekend, according to figures released Sunday.
The Associated Press contributed to this report.