Back again *sigh*- should I delete her off facebook?

I feel like such a fool....
When my sociopath fiance broke up with me I became friends with a girl who seemed to be going through the same thing.
She was quite clingy and full on and to be honest there were some warning signs, but I ignored them because- well shes female right?

Aaaanyway......my parents and one of my other friends said they thought she was a narcissist or there was something wrong with her. I ignored it, fool that I am.

Basically i had a lot of fun with her for a year and she was my best friend. We shared everything and she made me feel great about myself.
Things started to change a few months ago....I could feel her devaluing me....you know when you just KNOW.
No need for all the details, its the same as all of them. But basically I have found out from two separate sources the things she has said to others to try and discredit me and my reputation behind my back. And omg sooooo many lies.
She has been revealing her true colours over time....she keeps friends around even tho she doesnt like them because they buy her things. She bitches about every friend she has.....shes just awful :(
Anyway the more her true colours have been coming out, the more ive been disagreeing with her..and because Im not falling at her feet agreeing with her every little thing, she seems to have now stopped me from seeing all her posts on facebook. She used to post on facebook ALL the time, and now I cant see anything. Im still a friend but I cant see anything. Do you think I should delete her on there?