Healthy & unhealthy
Important to remember that there is healthy narcissism
and unhealthy narcissism. When it's healthy, the person has appropriate self-esteem and good feelings about herself.
When it's unhealthy, the person is very self-involved and/or needs a lot of "stroking" and external reinforcement in order to feel ok about herself -- and, even then, the need goes so deep that it's almost insatiable.