She said Depp has hit her, police couldn't find any proof. They then (after the scandal went public) settled things out of court and she removed the request for a restraining order.
Everything was basically "fine"
Then 2 years later or so she wrote an article where she again said "she is a public figure representing domestic abuse.” Implying that Depp did do shit to her AGAIN.
Defamation fits quite well imho, since this caused issues again and she has no proof.
Or maybe she just shouldn't have taken the settlement then, which is kinda telling me that they "argued it out and it wasn't so bad".
The case is more about that article than anything else actually.
After that, she doubled down and called him "the Monster" and that he put her through broken glass and all that kind of shit, without any scars to show for.
Imho, she's obviously lying. The PTSD test thingy they did and the doc calling her out is kinda pointing that out as well.
At least that's how I understand the whole thing.