Narcissa was certainly snobby and elitist like her husband. And shared his disdain for Harry, Dumbledore, non pure-bloods, "mudbloods" (guh) and muggles. We see this best when she is in Diagon Alley, in Madam Malkins. But there are several glimpses throughout the books. I think she was certainly prejudice and held herself higher than most people.

However, I also do truly believe that she was a very loving and protective mother. Draco was a mummy's boy.