Here she was discovered by the conductor Artur Rodziński, made her operatic debut in 1923 at the Grand Theatre, Warsaw[1] as Amneris in Verdi's Aida with great success.

In operas such as Il trovatore, Un ballo in maschera, Don Carlos, Fidelio, Le nozze di Figaro, Andrea Chénier, Lohengrin, Tannhäuser, Die Walküre and Halka she took on more than forty roles in the mezzo-soprano and soprano genres in the 1920s.

In 1929, Wermińska left Poland and made guest appearances in Vienna, Berlin, Bucharest, Prague, Riga, Stockholm, Copenhagen, Milan, Rome, Venice, Madrid and Alexandria, among other places.

In Budapest she appeared alongside Feodor Chaliapin in Faust, which invited her to perform in Boris Godunov at several European theatres.

During the period of the Second World War, Wermińska lived in South America, where she had engagements in Argentina (Teatro Colón), Brazil, Chile and Mexico, under the conductors Bruno Walter Fritz Busch and Wilhelm Furtwängler and with soloists such as Kirsten Flagstad, Maria Caniglia, Fedora Barbieri, Beniamino Gigli, Lily Pons and Mario del Monaco.