Her unwavering ability to deny the things she has done, even when presented with facts or memories of actual events. She will flat out deny everything to the point of even accusing me of making things up.
The sheer destruction she has caused, in not only my life, but my father's life and my sister's life, along with other people throughout her life including her extended family members, coworkers, and basically anyone she forms a relationship with.
Everyone comments about her strange behavior and her blatant disregard for other people's feelings.
There are way too many stories to go into detail about here, but the things she has done would make anyone's jaw drop. She's a very spiteful person who can easily lie if it suits her best interest and she doesn't care who she hurts along the way.
If you aren't with her, you're against her, and if you're against her you better watch out because her wrath is terrifying and she will go to extreme lengths to make life harder for that person.

Her emotional and mental torment, yelling, calling me names like "pathetic", "stupid", the B word, all while I was growing up even at young ages. She of course denies all of this. She also denies having a drinking problem even though me and my sister have a running joke that every time we would lose her in a grocery store we always knew to go to the liquor aisle because she would be there and sure enough she always was - not even kidding.

The divorce was the worst. When I was 13-14 she moved her boyfriend in to live with me, my sister and my dad. So we all had to live with this creepy strange man in our home while my dad was there too, I was traumatized by this after all the years of hell we had already gone through.
She still thinks doing that was totally normal and not a big deal.
Oh yeah and she ignored us entirely throughout that process.

When we left that home finally, we drove away and I didn't even say goodbye to her. I went No Contact for a few years after that, and occasionally I would attempt to speak to her over the phone to "give her another chance" because I always hoped she would somehow realize her mistakes and apologize, silly me. I told her she wouldn't be allowed back in my life if she did not apologize for all the hurt she caused me, she refused, and she or I would hang up and not speak to each other for another long period of time.
To this day, she claims that I made the choice to not let her into my life - but it was actually because she refused to apologize. You would think any mother would simply apologize just to try to patch up the relationship with their daughter - but no.

Apparently to her, it's all my fault for the shambles our relationship is in. So I think Narcissist fits her very well. The destruction of others around her, while she holds tightly onto her own self preservation at all costs.