Her film roles included appearances in Monkeys, Go Home! (1967), The Impossible Years (1968), Death of a Gunfighter (1969), The Beguiled (1971), Eight Days a Week (1997), and TV horror movies such as The Horror at 37,000 Feet (1973) and the TV remake of Piranha (1995).

Carr made guest appearances on Star Trek: Deep Space Nine, The Waltons, and The Paper Chase; played Henry Fonda's character's daughter for thirty-nine episodes of The Smith Family; and portrayed Kathleen "Kick" Kennedy, John F. Kennedy's favorite sister, in a television movie, Young Joe, the Forgotten Kennedy. She appeared in the miniseries Once an Eagle (1976) and had a recurring role as Margaret Devlin in the western series The Oregon Trail (1977). In the 1965-66 television season, Carr played Kathy, a student at a private girls' academy in California on The John Forsythe Show. She portrayed Karl Malden's character's daughter on The Streets of San Francisco (1972–77), as well as in the TV movie sequel, Back to the Streets of San Francisco (1992). Carr's only television series in which she had a lead billing was the short-lived CBS sitcom Miss Winslow & Son (1979), where she played Susan Winslow, the single mother and titular character.

In 1977, she was nominated for the Best Supporting Actress Golden Globe for her performance in the miniseries Once an Eagle.

Carr had a recurring role as the Editor, reporter and Photographer of the town newspaper in the 1981–82 television series Bret Maverick opposite James Garner, a sequel to Garner's 1957 series Maverick.

She is also a singer and sang in The Sound of Music, dubbing the high singing voice for Duane Chase as Kurt, and in Walt Disney's The Jungle Book, as The Girl. She released an album, The Carr-DeBelles Band, in 1988.