But if he had not been Diane’s husband testifying - if, like Alicia, it had been Diane’s husband on trial - Diane would have done exactly what Alicia did. So no, I have no sympathy for Diane.
I would have been more satisfied with the ending if Alicia had affirmatively decided to be alone. Since the time she had kids, she was always responsible for someone. It would have been appropriate if, after Grace is gone to college, that she became responsible for only herself.