I agree with the therapy route, but let's not try to "trick" anyone. Take the high road and be honest and decent with her. Once you are ready to invite her to therapy, do so, and if she refuses then it's on her.
She'll hold it against you if you trick her, but if you openly and honestly take steps to help her understand and she refuses then she's the one with the problem, and deep inside she'll know that whether she admits it to you or not.