One of the saddest aspects of having a female malignant narcissist in your life is the effect it has upon your relationship with other people. These predators work by socially isolating you, and they do it by creating divisions. They are so good at sowing discord that their ability to do so seems almost superhuman.
At some point, when you are pulling away from the narcissist, you also need to take a look at your relationships with other people with whom she is also involved. That's because she is single-minded in her pursuit to isolate you and to separate you from your support network. This is a very painful process, because some people who know and love will be less loyal than you had hoped.
The narcissist splits people by forcing them to take sides. Typically, this is done through very subtle maneuvers, such as playing upon their need to fit in, or by managing to infiltrate their lives and become very helpful if they are having any difficulties.
If you're part of a social circle, or if this drama is playing out at work, you've probably noticed that you now feel uncomfortable in this setting. That's because the narcissist has poisoned it. If someone is moving away from you, and you sense this, let them go. They aren't worth it.
Eventually, as you cut ties with the narcissist, you may find you also need to take a step back from others whom you know, still friendly with her. This is excruciating, but oftentimes necessary.
Once you remove this toxic person from your life, you will grow. New and wonderful people will then start to appear. Trust me, I've been there.