The term socialite referred to a woman who was visible in high society.
Within the Dixon Hill series holoprogram, Jessica Bradley was described as a wealthy socialite in a newspaper article's headline announcing her murder. (TNG: "The Big Goodbye")
Lady Wantsomore, a character from Julian Bashir, Secret Agent, was, according to Bashir, "a beautiful socialite who's brainwashed to assassinate the Queen of England". (DS9: "A Simple Investigation")