Later in 1880, together with John McCaull, she co-founded and produced a new opera company, the Blanche Roosevelt English Opera Company, appearing in its productions, which were financial failures, of Alfred Cellier's "The Sultan of Mocha" (Union Square Theatre, New York, September 1880) and B. C. Stephenson and Cellier's operatic adaptation of Henry Wadsworth Longfellow's "The Masque of Pandora" (Boston Theatre, January 1881). During this project, Roosevelt became friends with Longfellow. In 1881 she appeared in New York in concerts, and on returning to England she was booked by Maurice Strakosch for his touring opera company to appear as Marguerite in "Faust" at the French Opera House in New Orleans. She returned to Broadway as Mabel in "Pirates", where a critic called her "a beautiful girl, somewhat uncouth in her gestures with a well-taught but bodiless voice which gives promise of effect but, alas, breaks the promise to the ear". Soon afterwards, she retired from the stage, largely at the behest of her husband, Signor Macchetta, an Italian who had succeeded to the title of Marquis d'Alligri. She returned to Europe by 1882 and began a career in journalism and literature.