This would last until the person threatened her narcissistic view in some way (i.e. hinted that she was not god's gift to the earth) and then she would have no problem belittling them, cutting off all ties, threatening lawsuits and following through, etc etc.
Ha ha, yeah, I forgot about the lawsuits. My ex-NPD fell on the paranoid/victim side of things and always thought he was being persecuted for being so amazing and successful. I can't believe how many people he's sued.