Hardin started her acting career as the young star of the television series Thunder (1977–1978), and has appeared in over 70 movies and television programs since, including episode 39 of The Love Boat in 1978, two episodes of the medical drama Quincy, M. E. (as Amanda in the 1979 episode "Never a Child" and as Abagail "Abby" Garvin in the infamous 1982 anti-punk rock episode "Next Stop, Nowhere"), two 1981 Little House on the Prairie episodes (as Belinda Stevens in "The Reincarnation of Nellie", Parts 1 and 2) as well as playing Michele Pierson in the 1983 television movie Little House: Look Back to Yesterday.