Actually there would not be much use 'telling' her to do this or that. She will make her own choices. It doesn't mean i would shrug it off. Quite the opposite, i would be processing nearly all of it alongside her. I would ask her underlying questions to require her to rethink her assumptions. What she does with that opportunity to reevaluate is still in her domain, not mine. I would be a support to her regardless of her choice. It would not be my position to cut her off if she chooses to stay. It would be my position to help her see other options and to feel empowered. There would be culture, pathology, experience, and a myriad other issues playing into it. There is a boundary of personal space that must not be violated.
Tough love is an important tactic - especially for those involved in a situation. Tough love can also be the easy way out - bypassing the other person's autonomy. Sometimes tough love is when we must tolerate another person's choice. You do what you can to make them feel strong, but then it is their own life and choice.