I would not leave if I were you. She should leave. This is more drastic, but ...you could pack her things neatly and set out on the end of the drive, with a 'Good Luck' note attached. Stand firm. I would remove 1/2 of your savings and set aside. The other half would be hers. Anything you own, split down the middle, including bills. Hopefully, none of this is needed, and she will come to her senses soon. Good luck to you!

I would not leave if I were you. You could pack her things neatly and set out on the end of the drive, with a 'Good Luck' note attached. Stand firm. I would remove 1/2 of your savings and set aside. The other half would be hers. Anything you own, split down the middle, including bills.