[11] In 1978, she appeared in an episode of Fantasy Island[12] as Toni Elgin, a woman desperately trying to save her marriage.

She has continued to make appearances in a number of popular television series over the years, including Murder, She Wrote, Marcus Welby, M.D., Sons and Daughters (CBS, 1991),[13] and Law & Order.

A reviewer for The New York Times described the show as "the always ingratiating Miss Arnaz as a psychologist who not only writes an advice column, but also takes calls from listeners on her own radio program.

It was unsuccessful, but The Rosie O'Donnell Show would use the same format a year later to much greater success, prompting Arnaz's agent to pitch a revival that would not be picked up.

In 1986, she won the Sarah Siddons Award for her tour with Tommy Tune in the international company of the musical My One and Only.

[29][30] She has numerous other theater credits, both in the United States and abroad: Seesaw (first national company, 1974[31]), Whose Life Is It Anyway?, The Guardsman (Paper Mill Playhouse, Millburn, New Jersey, January 1984[32]), The Wizard of Oz in Concert: Dreams Come True (Concert at Lincoln Center, 1995, televised[33][34]), Sonia Flew (Coconut Grove Playhouse, Florida, April 2006[35]), The Witches of Eastwick (London, Theatre Royal, Drury Lane, June 2000[36][37]), Vanities (Mark Taper Forum, Los Angeles, 1976 as Kathy[38]), Neil Simon's Lost in Yonkers (Broadway[39]), Dirty Rotten Scoundrels (Broadway, May 23, 2006, to September 3, 2006[39]), and Terence McNally's Master Class (Seacoast Repertory Theatre, Portsmouth, New Hampshire, April to May 1999[40]).

[43][44] Arnaz made feature-film appearances, including The Jazz Singer (1980) in which she co-starred with Neil Diamond and Laurence Olivier.