[2] She had a recurring role in the CBS legal drama The Defenders (1961–1965) as the fiancée of Kenneth Preston (played by Robert Reed).

In the 1963–1964 season, she guest-starred on Channing, an ABC drama about college life starring Jason Evers and Henry Jones.

Hackett had one of the starring roles in the 1966 Sidney Lumet film The Group, along with Candice Bergen, Larry Hagman, Richard Mulligan, Joanna Pettet, and others.

Hackett also had notable parts in the classic Western comedy Support Your Local Sheriff!, with James Garner, and the 1973 murder mystery The Last of Sheila.

She starred in the 1974 adaption of Michael Crichton's novel The Terminal Man, along with actors George Segal, Donald Moffat, and Richard Dysart.

She appeared in the September 22, 1979, episode "Grass Is Always Greener" of The Love Boat as Julie McCoy's former classmate from the line's cruise director course.

[1] A funeral mass was held on Wednesday, October 12, 1983, at St. Victor Catholic Church in Los Angeles, California.