Elements of her back story are revealed over several years. She was born in San Diego, one of four children. Rebecca's father (Robert Prosky) is an ex-Navy man and her mother was a concert cellist. Rebecca's sister Susan (Marcia Cross) is an actress and former Miss San Diego who has stolen her past boyfriends. Revealed in The Last Angry Mailman (1987), Rebecca was nicknamed "Backseat Becky" for her behavior as a party girl, while at the University of Connecticut.
When Sam sells the bar at the end of the fifth season to sail around the world, the Lillian Corporation buys the bar. Rebecca is appointed manager and corporate suggests that hiring back Sam as a bartender is an auspicious business move the start of the sixth season. Originally Rebecca comes off as calm, cool and collected, but it gradually seen to be as neurotic as the rest of the characters on the show. She is career-minded to the point of selfish at times, as seen in Bar Wars VII: Naked Prey, where she puts her career ahead of Woody's life.
In the final episode, One for the Road, Rebecca marries plumber Don Santry.
Her final lines are:
Rebecca: Ironic, isn't it? I shoot for Donald Trump and I end up with Ed Norton.
Frasier: But you did good.
Rebecca: I did, didn't I? *giggles and leaves Cheers*