Hi, Rose76. I see no one has tackled your question. I am very familiar with borderline personality disorder, since I once had the diagnosis, but my last several psychiatrists say they don't see that in me, after I dealt with my anger from the past and went through two bouts of DBT.

At any rate, of course, we can't diagnose here, but from those examples of her rejecting you and then returning, it does seem like her reactions are extreme--i.e., a black-white, good-bad responses. And that's in keeping with being borderline.

Of course, we add her drinking into the mix, as you say.

The "all sorts of bad things will happen to you" remark also seems strange to me. Was it a threat? Just an attempt to make you scared enough to move? Or some sort of delusional thought?

I suggest you just leave the ball in her court and accept her when she's a nice sister and friend--but also accept that sometimes she falls out with you, and she'll come back when she's ready. I hope she returns, if that's what you want, but I don't think you'll be able to do or say anything that will help. You might have to accept that she's just that way.

Has she had any psychological treatment? Been put on a mental ward? If so, then she would have received some sort of diagnosis. Wgat do other people think of her behavior?

The fact that she'd have to be put in handcuffs sometimes after getting so mad seems to clinch the idea that she has some mental issue to me. But, again, please remember that I don't have the qualifications to make an official diagnosis. Okay?

What do the rest of you think?