Some people can just be shitty people, it's not necessarily part of bpd as there are many different manifestations of the symptoms
It may be best to use other resources than this subreddit to understand bpd as this is a place for emotionally unstable people to vent and seek advice
When I was first diagnosed I bought this book and it helped me to understand a lot
I'm so glad you are doing this for your sister.
I have BPD and reading this book now:
https://www.amazon.com/Big-Book-Borderline-Personality-Disorder/dp/1936268612
So far great book, written by someone with BPD as well.
I bought this book when I was first diagnosed and it's helped a lot
I hope it goes well for you!
I got my BPD diagnosis by telling my GP I was struggling with mental health issues again and I was then referred on to the Community mental health team where I was diagnosed
Still waiting for DBT treatment but hopeful
Some days are better than others
In the meantime I bought these 2 books to better understand and to get a headstart because the DBT waiting list can be quite long
I've recently been diagnosed with BPD and bought this book, it's helped a lot to understand