Hey, Charlie. I have a friend who has BPD who is going through a hard time right now and I need some help. A couple of days ago, I had to modify my plans with her because my dad needed me to come to his house. She got very angry (probably due to feeling that she was abandoned) and defriended me, as well as several of our mutual friends, on just about every social media site. I am worried for her mental health, but don't know how to help her without her lashing out. Do you have any suggestions?
oh no! that's really tough, and I can't imagine how stressful this situation must be for you, your friend, and everyone else. but I'm gonna respond with how I think I would behave and want to be approached if I were in her place.
I'm gonna hazard a guess and say the issue isn't that she's feeling abandoned, but finally got the confirmation she needed to round off a list of "signs" that you aren't really her friend, or hate her, or whatever. this isn't anything that you've actually done - for me, I'm always unconsciously looking for evidence that someone doesn't like me. it can be something as innocuous as taking a while to answer a text, or looking at a watch when I'm speaking to you. there's an entire form of psychotherapy called mentalization-based treatment that's specifically meant to address these types of misconceptions. it's actually a huge problem for me, and any social interaction I have will always have the running mental commentary of talking myself out of this type of thinking.
I'm not trying to suggest that you necessarily have done anything wrong here, I'm saying it's possible that she may have interpreted some of your actions as being less than innocent, and that your sudden cancellation may have been the last straw of sorts in what is, for her, a sizable list of reasons why you don't like her anymore. especially if anything else has happened recently (did you have a conversation that maybe didn't go to well? did you have to cancel/change any other plans recently?)
can you still email her? my suggestion would be to write to her to remind her how much you care about her. tell her that you want to be friends no matter what, maybe write about a fond memory you have about the two of you, of course apologize profusely for changing the plans. tell her why you value your friendship. (but don't go over the top, if you're not super best friends don't pretend that you are, otherwise you'll sound fake, which will make things worse.) ask how you can make it up to her, for her forgiveness, maybe invite her out for coffee or whatever. tell her that you're committed to maintaining your friendship, no matter what happens. then give her some space to stew it over, like a week maybe, if she still doesn't answer then maybe send another email? if she does lash out in a reply email, that's okay. if she's mad, let her be mad. acknowledge her feelings and apologize again, validate her and however she's feeling, remind her how much you value your friendship and want to fix things. it may take a while. but hopefully, with enough patience and persistence, you both can recover from this.
I hope this helps, please let me know if there's anything else I can do. (and borderline followers, anything you would add, or other suggestions you would make?)