The soprano also appeared on Broadway in La serva padrona (as Serpina, 1944) and Mr Strauss Goes to Boston (as Brook Whitney, 1945).
MacWatters sang at the New York City Opera from 1946 to 1951, in The Pirates of Penzance (as Mabel, conducted by Julius Rudel), Rigoletto (as Gilda, with Giuseppe Valdengo and Luigi Infantino), Il barbiere di Siviglia (as Rosina, opposite Enzo Mascherini), The Old Maid and the Thief (as Laetitia, with Marie Powers), Le nozze di Figaro (as Susanna), Les contes d'Hoffmann (as Olympia), and Ariadne auf Naxos (as Zerbinetta).
[9] MacWatters appeared at the first season of opera in English at Covent Garden following World War II, in the name part of Manon and as Sophie in Der Rosenkavalier, in 1947.
MacWatters's house debut was also as Adele, with Regina Resnik, and, later, Eleanor Steber, as Rosalinde von Eisenstein.
In 1957, a twenty-five year dual performing and teaching career began for MacWatters at Indiana University when she was offered a position on the voice faculty.