In 1956, Nell joined the new Poindexter Gallery. Reviewers praised her first show. The following year, she was awarded a residency at Yaddo (the artists’ colony in Saratoga Springs, New York), meeting poets Jane Mayhall and May Swenson. Afterward, she traveled to Mexico City and Oaxaca, where she worked at night by the light of an oil lamp. On her return, she spent several weeks at the MacDowell Colony in New Hampshire, followed by another stay at Yaddo in December, when her fellow residents were poets Barbara Guest and Jean Garrigue. Nell spent the summer of 1958 in a rented studio in Gloucester. It was there that ARTnews writer Lawrence Campbell visited her to write a major piece about her work on Harbor and Green Cloth, illustrated with photographs by her friend Rudy Burckhardt. A second version of this painting was purchased by the Whitney Museum of American Art.