The actor made the pledge as she ended her marriage to Johnny Depp, saying she would split $7 million between the ACLU and a children's hospital. Depp's defamation case against Heard is ongoing.
Depp has testified that Heard severed his finger with a shattered vodka bottle. On Thursday, her attorney used Depp's own words to suggest he did it himself. Depp is suing Heard for defamation.
The actor said Friday that Warner Bros. asked him to resign after he lost a libel suit in the U.K. earlier this week. As a result, the studio has pushed back the third film in the series to 2022.
Last year the actors brought their pet dogs, Pistol and Boo, into Australia without properly quarantining them. Heard pleaded guilty Monday, and both dog owners recorded a solemn apology video.
Australia's agriculture minister said Depp sidestepped the country's laws because his dogs did not spend the required 10 days in quarantine. The minister threatened to destroy the dogs.