Does this sound like someone with narcissistic personality disorder or borderline ?

So I recently had a falling out with my biological sister a few weeks ago because she started harassing and bullying me on Facebook because I told her that I didn’t trust her because she kept interfering with my personal life all the time and she kept telling me I needed help because I show narcissistic and manipulative traits apparently but she was the one accusing me of manipulating and blame shifting her when she was doing the same things to me, I hadn’t seen her for years until my adopted Mum (biologically our great auntie) passed away back in 2019 but yet she expected to have my full trust already even though we barely had any contact over the years, I finally decided I had enough of her behaviour and blocked her on Facebook but then she went on her old Facebook account and started harassing me, then I blocked her on that account as well but then she created a new Facebook account under a different name and threatened that she would keep making Facebook after Facebook until I heard her out. My sister kept sending me screenshots during conversations she had with our Auntie trying to prove she said bad stuff about me behind my back calling me manipulative and a narcissist, my sister even threatened to print out the screenshots and post them to me if I keep refusing to read them but what is messed up is she was trying to prove stuff our Auntie said about me during their conversations she also accused me of as well but calls out our Auntie for the same things she called me.