Her claims are allegations, not truths. If I were the one getting death threats about my appearance in a controversial film, I wouldn't hesitate to lie about how much I knew about the film going into it.

As far as what actually happened, I haven't seen any alleged contract, and it seems to me if you act in a film you should expect no control over the final product unless you have a contract saying you do. The nature of the film could be changed; your lines could be dubbed.