Rather than contradict her, an option might be to use active listening. On this approach you don't tell her that you agree or disagree with what she says. Instead, you show that you understand what she said, without judging it or her.

Let's say that she says You have always hated me.

In the past you might say No, that's not true, I love you.--and she would get angry.

With active listening you would say something like:

Right now you have such a strong feeling that I dislike you.

You don't agree or disagree, you show that you understand.

When you show that you understand (without judging), you are with her. She isn't alone anymore.