She has spent time staying with me on various occasions and I wouldn't put it past her to have her claim that I raped her.
Hi again,
I'm sorry I missed this detail when I responded to you earlier. I agree that there's always a risk of your niece re-writing history and accusing you of nefarious things. My adult BPD stepdaughter tried pulling that stunt a few times. Initially, I tended to give her the benefit of the doubt. But as time passed, her claims became more outlandish, and she started to change her tune when challenged. In parallel, as I discovered more details about past incidents from other people, I realized that she had wildly misrepresented events, always portraying herself as a victim, when more often than not, she was the abuser!
I have some additional advice for you, which is this: please don't let your niece stay with you in your home again. It sounds to me like your home is her back-up housing plan. Let me guess: she loses a job, gets evicted or breaks up with a romantic partner, and she expects you to take her in, right? She can't stay with her own mom because she's toxic, right? I've been in the same situation with my adult BPD stepdaughter. She has rebounded to my home several times in her adult life, basically every time she quits and gives up--her job, her rooming situation, her one-week romance, her studies. When she lives with me, she's essentially on vacation, in the sense that she's vacating her life. Sure, she promises to work and be nice, that this time will be different, but she keeps her promises for only a few days. She avoids responsibilities and dealing with real life. By letting her stay in our home, we're essentially enabling continued dysfunction, and we can't get away from her very negative aura. That is not good for me or my husband, or our marriage. And enabling dysfunction is not good for her, not at all. My opinion is that by "helping" her, we're actually hurting her, because she's able to avoid getting professional help and working on herself.
Your niece might guilt-trip into you helping her. She might accuse you of being a horrible person until you relent. She might make all sorts of promises to convince you to let her stay with you. She'll try to push all your buttons--of fear, obligation and guilt. PwBPD can be extremely manipulative that way, but they're good at it, because it has worked for them in the past. But here's the thing: your niece has gone "nuclear" already. If she doesn't get what she wants, she threatens suicide. If you take her seriously and call 911, she turns around and hates you for believing her! Then she starts threatening you. It seems to me that she's MAD: threatening mutually assured destruction. That's why you can't let her live with you anymore. You can't fix her. Only she can do that. You are not the solution to her problems; she is. I think she'll decide to get help only once she hits bottom. If you prevent her from hitting bottom by allowing her a safety hammock in your house, you run the risk of ruining your life right alongside hers.
I know this might sound like tough love for your niece, but really it's tough love for you. Please, help yourself by saving yourself first. Let your niece live on her own or get evicted. Mabye then she'll have a breakdown, hit bottom and decide to get professional help, because getting professional help will seem like her only remaining option. Please don't let your couch be an option for her. All that does is prolong her misery and include you in it.