It seems to me that if one suffers from the disorder and is of above average intelligence then the table is set for a very successful life...a life that relies on dishonesty, manipulation and the destruction of others but still, in the secular societal sense, successful.
That’s sad. I hope you are able to get along with that daughter. I found an interesting article while ‘wondering’ about nature versus nurture.
http://www.daughtersofnarcissisticmothers.com/cause-of-narcissistic-personality-disorder.html