I started off in therapy with the latent suspicion that my mother has NPD.
My therapist is humanistic and doesn't really 'do' labels but prefers to see people for who they are.
15 months later and my therapist believes that my mother has NPD.
My mother is very subtle in her behaviour, yet she showed a repeated inability throughout her parenting life to ever put her children first. With her, it's pathological.
So it's not really about the constant digs, the need for admiration and all the other big ticket behaviour that narcs attract attention for. As others have said, people can behave in silly, attention seeking ways without having NPD.
My mother is silly and attention seeking, but more importantly she was so incapable of allowing her children to have needs of feelings she inflicted massive neglect which had far-reaching consequences.
So I guess what I'm saying is that people can display narcissistic traits, but for me true narcissism isn't about what's there it's about what is lacking, it's about a pathological lack of empathy and an inability to put others first.