Hi Methos,
Thank you for sharing your story. I hope others with more experience will join us here and share their insights. As I read your story I think of all the times my h has made threats. He's only run off once, so far, but he has definitely worn down my feelings for him with his break up threats and extreme behavior. It is hard to have strong feelings of love when someone pushes you away so much. I do what I can to maintain my feelings, but it is not always easy. I do my best.

May I ask what your feelings are at this point? Do you feel any amount of love for her? Do you want her to stay or would you prefer her to go?
If you can't/don't feel "love" towards her... .can you express some validation/compassion that your living situation sounds as if it is highly stressful and that anyone might feel a need for a break from it? Even though her hurtful words were out of line it sounds, perhaps it is understandable to some degree that she got fed up? Can you relate to the feeling behind it if not the expression?
Sounds like her leaving permanently is not an option unless she opens up to relatives. I'd so to go ahead and take "begging" her to come back off the table, that isn't productive for either of you. She may want to hear feelings and emotions from you, but you don't need to beg anyone to be with you ever, okay?
Is there anything that can be done to make the living situation less stressful overall?