THE arc of the actress and filmmaker Barbara Loden’s life was dramatic enough to be a Hollywood movie. She survived a hardscrabble Southern childhood; moved at 16 to New York, where she was a pin-up model and nightclub dancer; then went on to win a Tony award, marry the director Elia Kazan, and in 1970, write, direct and star in her own film — the bracingly realist “Wanda” — before dying of cancer 10 years later at 48.