Answer by taking a quote from the following article:

Kate O'Mara (10 August 1939 - 30 March 2014) was an English film, stage and television actress, and writer. O'Mara made her stage debut in a 1963 production of The Merchant of Venice. Her other stage roles included Elvira in Blithe Spirit (1974), Lady Macbeth in Macbeth (1982), Cleopatra in Antony & Cleopatra (1982), Goneril in King Lear (1987) and Marlene Dietrich in Lunch with Marlene (2008). Her films included two 1970 Hammer Horror films: The Vampire Lovers and The Horror of Frankenstein.

O'Mara spoke on several occasions about her experience with the casting couch. On an episode of The Word in 1994, O'Mara claimed that American producer Judd Bernard pulled down her panties during a hotel-room audition for the Elvis Presley vehicle Double Trouble. In her autobiography Vamp Until Ready: A Life Laid Bare, O'Mara described this incident and "many other close encounters with... this very unpleasant and humiliating procedure", including with a well-known television casting director, the boss of Associated Television at Elstree Studios, and the director of Great Catherine.  O'Mara continued to make television appearances throughout the 1990s, including Cluedo (1990), and playing Jackie Stone (Patsy's older sister) in two episodes of Absolutely Fabulous (1995-2003). In 2001, she had a recurring role in the ITV prison drama series Bad Girls before appearing in the short-lived revival of the soap opera Crossroads. She continued to perform on stage and in March 2008 she played Marlene Dietrich in a stage play entitled Lunch with Marlene. From August to November 2008, she played Mrs Cheveley in Oscar Wilde's stage play An Ideal Husband directed by Peter Hall and produced by Bill Kenwright. She performed in radio and audio plays. In 2000 she reprised her role as the Rani in the BBV audio play The Rani Reaps the Whirlwind, and in 2006 she made a guest appearance in the radio comedy series Nebulous.  In 2012, O'mara appeared in a theater adaptation of Agatha Christie's Death on the Nile.  She became a vegetarian and animal rights activist.

Did she do any other plays?
she played Mrs Cheveley in Oscar Wilde's stage play An Ideal Husband