Our expert says:
It sounds, from your description, as though she has been like this for years, and as though these problems are based in her personality ( maybe even to the extent that we would call it a Personality Disorder ) and her habits of how she thinks about and relates to other people.
I understand your concerns very well. It was nonsense for her to move from the house you bought her, to one she now wants to buy from someone not entitled to sell it to her ; on the basis that her old neighbours hated her, while she is busy making the new neighbours hate her too !
The problem is that while she might be helped if she sincerely recgnized that she has a problem and causes problems for others, and sincerely would be prepared to work with a psychotherapist to change her bad habits. But that sounds rather unlikely. And without her eager co-operation to change things for the better, they will not change.
I would guess that she has also threatened suicide before, too without actually doing it. It may be necessary NOT to get involved in arguments with her, but to be pleasantly firm and clear about what you will and won't do, what you can and can't do, and that you can't afford to allow her to blackmail you with her threats
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