Preminger insisted that she live in New York City to become Americanized, but he did not want her to live in Los Angeles for fear she would just be a "starlet a-go-go". She was approached to be the title character in "Lolita" (1962) with James Mason, but because Preminger held her contract, he vetoed the idea. Mineo and Haworth were also considered for the film "David and Lisa" (1962), but once again Preminger refused permission. Preminger let her make three French films; "Les Mystères de Paris" (as Fleur de Marie; 1962), "" (as Cécilia; 1963), and "Ton ombre est la mienne" (as Sylvie "Devi" Bergerat; 1963). Haworth co-starred alongside David McCallum in the" Outer Limits" episode, "The Sixth Finger" (1963). Haworth visited Mineo in Utah in November 1962 and had a nonspeaking role as an extra in "The Greatest Story Ever Told" (1965). She made four appearances on the television programme "12 O'Clock High". In "The Sound of Distant Thunder," she played an English girl, Mary, who falls in love with Lieutenant Andy Lathrop (played by Peter Fonda). The same season, she played a deaf girl, Nora Burgess, in an episode entitled "To Heinie with Love". She then played Lieutenant Fay Vendry in two episodes, "Runway in the Dark" (1965) and "The Hotshot." In 1965, she appeared in an episode of "The Rogues" entitled "Mr. White's Christmas" as Timothea, and really loved working with David Niven and Charles Boyer. She appeared in one of the final episodes of the series "Rawhide", "Duel at Daybreak", as Vicki Woodruff. Haworth first hurt her back in an accident on the set when she jumped from a runaway buggy and team of horses. She then caught pneumonia and was bedridden for two months after she had to stand waist-deep in a man-made pond for six hours doing retakes. She starred in the horror films "It!" (1967), "The Haunted House of Horror" (1969), "Tower of Evil" (1972), "Home for the Holidays" (1972), and "The Mutations" (1974). She only did "It!" for the money, hated her hair in the film, and hated the film altogether.