It's an exercise in futility trying to preserve a friendship with a borderline or a narcissist. Although things may go well for a while, it's only a matter of time until something happens to trigger her rage. People with malignant personalities often get upset over very inconsequential matters, which the average person wouldn't even notice.
Because of their inherent character flaw, they can only think in black and white terms. At any given moment, you are either all good or all bad. There's no middle ground. In her mind, if you happen to be good "good," then it's smooth sailing. If not, then you become public enemy number one. When this happens, a toxic personality will try to draw bystanders into the drama. Because lying is so natural for a malignant narcissist, she will stretch the true facts, and embellish the rest of the story with lies.
Narcissists are very charming, especially if you don't know them well. They also know how to mimic normal human emotions, which they don't have, in order to come across as convincing and believable. So they're able to create a lot of conflict in the lives of people close to them.
Life is too short to be living it walking on eggshells, in fear of getting on the bad side of a malignant narcissist. There are seven billion people on the planet and most of them do not suffer from this very debilitating character flaw You're much better off cutting the narcissist loose and spending time with healthier folks.
Pixabay photo top by Hans