Anyone who's ever been targeted by a malignant narcissist knows how easily morally disordered people deceive others. Usually, this becomes apparent in hindsight. We learn of their lies only after a lot of damage has been done to our personal and our professional lives. Narcissists are always on the take, so we may also have given them money, after falling for their various sympathy ploys.
Another student of "narc-ology," who posted something on Pinterest, recently brought up a good point. The lies that come to our attention are probably just the tip of the iceberg. There are likely many more outrageous stories we don't know about.
One can only wonder what else was fabricated by a narcissist. Virtually anything is possible, given the fact that malignant personalities also like to "pull one over" on people. They make up stories for no plausible gain, simply because they take pleasure and pride in tricking others.
Malignant narcissists are deeply disturbed. They lie for the sake of lying and, oftentimes, hurt people just to see their reaction and watch the show. There is no upside to maintaining a "friendship" with someone who is fundamentally dishonest. An individual may apologize profusely after a display of bad behavior, but something similar will happen again.
If you realize that one of your female "friends" has a such a serious character flaw, don't try to analyze her. Just disentangle yourself, preferably before introducing her to anyone else you know. Narcissists revel in drama. Nothing will delight her more than to upend your other relationships.