Goldfinger made a big, stupid mistake. What she did was purposeful. As a writer, she knows the extent of Slander/Libel (both technically since it was written in script form and then released on the internet)
Actually, technically, it would be strictly libel. Libel is written, slander is spoken, and since both forms are written, it would be considered libel.
AP defines libel as, simply, "injury to reputation." So all they have to do is prove that the leak of the early draft of the script somehow damaged their reputation (and frankly, it's hard to see how it could not) to win this case.
It used to be that libel cases hinged on malicious intent. In other words, if the complainant could prove that the writer
deliberately intended to malign their character (intent being very hard to prove), then they might win their lawsuit. But no more. As AP says: "Words, pictures or cartoons that expose a person to public hatred, shame, disgrace or ridicule, or induce an ill opinion of a person are libelous."
Of course, this applies to newspaper reports of factual proceedings. It gets a little muddier with an obviously fictional story based on real people, and I think this is where malicious intent might apply. After all, fair comment and criticism are protected defenses, as long as they are not done maliciously. So it will be interesting to see where this case goes.
I agree with others that it would've been a whole lot smarter for Goldfinger to change the names. Everybody and their brother (and sister) is doing "ripped from the headlines" episodes these days, and then including the nudge/wink disclaimer of it not being based on a real person . . . when, of course, we all know it is. But usually the names are different enough that, even when we all know who the character is, the powers that be have the fallback position of saying the names are different, so clearly the characters are different from the people they're based on.