I don't think her decision to take the deal took into account whether jury nullification exists or not. The way you explained it sounds like retrocausality, though I don't know if that's the way you meant it.
Jury nullification isn't about fair outcomes, I should clarify, but about whether the law itself is lawful, representative of the people, or applied lawfully. Maybe that fits into the definition of fair I had in mind, but I was thinking on it more objectively, not subjectively.
There are proponents and opponents within the United States, true, but if a legal system does not permit punishment of jurors, then jury nullification is a logical byproduct of the system. And an important one I would argue. It fits into why trials by jury are important in a democratic legal system - the people have the final say, whether they realize it or not.
I get what you're saying, and yet it exists and a term exists for it.
I know there's no "nullification" verdict and the binary guilty/not guilty are the only recognized options, but nullification is used to describe the not guilty verdict despite any charges and evidence in a trial, which I'm sure you understand.