But it's naive to assume that the corporation you're dealing with won't use the contract to their advantage. You have to assume that it's going to happen.
You can say that I'm characterizing it as "blame the victim", but the creator is not a victim here. The movie that she created is intact. The likeness of a character that she in essence sold to Disney has changed. And I'm sure she still makes money from sales of this modification.
She's well within her rights to speak out against this change, but like I said, she signed away those rights. I'll concede that she probably had no choice in the matter, but let's not pretend that this was some unpredictable act by Disney.