In the 1960s, Barbara Hershey was an ingénue actress on television and small parts in films. There was something about her, more than sending young boys into puberty.
She co-starred in a television Western called The Monroes, about a family of kids trying to make it on the frontier without adult supervision, just a benevolent ranch foreman. I remember her from a few episodes as Gidget’s friend, and one of the houseful of kids in the film, Yours, Mine and Ours.
Hershey and David Carradine, who carried on a very torrid, public relationship in the early 1970s, producing a son originally named Free. Hershey changed her stage name to Barbara Seagull, which tells a bit of her thinking/lifestyle in those years. She starred in two low-budget films, The Babymaker, as a surrogate mother, and Boxcar Bertha, a period crime drama. Television guest starring roles and movies paid the bills.
In the 1980s, Hershey reestablished herself in Hollywood and began getting serious roles in feature films. A string of well-received, high-profile films included Stuntman, The Right Stuff, The Natural, Shy People, A World Apart, Hoosiers and Beaches.
Hershey also co-starred in two comedy-dramas, Hannah and Her Sisters and Tin Men.
Ticket 2 Ride 
I remember The Monroes. I think Ben Johnson played the one-armed ranch foreman. Yes, she did re-establish herself later as a serious actress, after briefly jumping on the hippie bandwagon.
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You are correct, Ben Johnson played that role.
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