[2] Hardt was born in Lawton, Oklahoma, the daughter of a Cherokee mother and German father.

[3] She played uncredited roles in numerous films and made a guest-starring appearance in the anthology television series Alfred Hitchcock Presents.

In 1959, she starred in the new CBS sitcom television series The Dennis O'Keefe Show playing Karen Hadley.

[4] Hardt guest-starred in television programs including Charlie's Angels, Dr. Kildare, The Donna Reed Show, Dynasty, Death Valley Days, Lawman, Perry Mason, Columbo, and Hotel (her final credit).

[6] Eloise Hardt died in June 2017, at the age of 99, in Palos Verdes Estates, California, U.S.[7]