In 1959, she played a friend of character Mary Stone (Shelley Fabares) on ABC's The Donna Reed Show, and had a supporting role in the sitcom The Betty Hutton Show on CBS, with her brother Gerald. In 1960, Perreau and Robert Harland performed as Sara Lou and Lin Proctor, a young couple from the east who have eloped and are heading west, in the ABC western series Stagecoach West with Wayne Rogers and Robert Bray [episode "The Land Beyond" (S1:E2)]. Also in 1960, Perreau was cast as Julie Staunton in the episode "Flight from Terror" of the ABC adventure series The Islanders, set in the South Pacific. She was cast in two episodes, "Don Gringo" (1960) and "The Promise" (1961), of the Nick Adams' ABC western series, The Rebel. In 1961, she played Mary Bettelheim in the episode "The Twelfth Hour" of the ABC/Warner Brothers television crime drama The Roaring 20s. She was cast in a recurring role on ABC's Follow the Sun series from 1961–1962 as a secretary, Katherine Ann "Kathy" Richards. She guest starred on The Rifleman in 1960 and 1961. She made two guest appearances on Perry Mason: in 1958 as title character and defendant Doris Bannister in "The Case of the Desperate Daughter" and in 1964 as nurse Phyllis Clover in "The Case of the Sleepy Slayer." In 1964, she also co-starred as Lucy, a beleaguered homesteader, on an episode of Gunsmoke titled "Chicken" [S10:E11]. In 1970, she appeared on The Brady Bunch ["The Undergraduate" (S1:E17)] as a math Teacher who becomes the object of puppy love by Greg Brady, one of her students.