TMZ has learnt from law enforcement sources and documents that Amber and Tasya van Ree got in an argument on September 14, 2009 at Seattle-Tacoma International Airport.
Amber allegedly grabbed and struck Tasya in the arm, which upset Tasya and led to Amber's arrest.
Amber Heard was arrested and booked for misdemeanor domestic violence. Her mug shot was taken and she appeared in court the next day.
TMZ also has obtained the audio of the court hearing, where the prosecutor declined to move forward with the case, reportedly because the women both lived in California.
The judge told Amber she was not off the hook and prosecutors could reconsider and refile within the 2-year statute of limitations.
Amber then thanked the judge and left the courtroom.
Amber heard has not responded to the report so far.