I'm going to respectfully disagree with you here:So the "bearing one another's burdens" verse is astonishingly applicable here. Imagine yourself in that type of situation, and what you would be willing to hear. And try and not treat her as a monster, but at the same time Wisdom may tell you in prayer to warn her in love that she may be destroying her life. It will depend on what God tells you to do, and how He tells you to do it. But remember: Even if He says to warn her, do so in a spirit of meekness, as someone doing so only because she cares for her. And to do this you will have to get your own hurt feelings out of the way, or she will only see you as clouded by your own feelings just as she is.
I wish you the best. Very tough situation.
I am not her. I would respond very differently then her here, and want to be treated very differently then she wants.
I cannot bear this burden for her-- she's not asking for help, and I cannot give it here.