[2] She then began studying for a Master's degree at the Royal Opera Academy in Copenhagen, and her teacher helped her develop her voice as an operatic soprano.

She also received financial support from the Skipsreder Tom Wilhelmsen, Karen and Arthur Feldthusens, and Sine Butenschøns Foundations.

[citation needed] During this period, she made her first appearances with the Royal Danish Opera, during the 2012–13 season, as the Dog and Owl in The Cunning Little Vixen.

[13] Davidsen appeared as Leonora in the Metropolitan Opera's revival of Verdi’s La Forza del Destino, which opened on February 26, 2024.

[15] She sang the role of Anitra in a recording of Peer Gynt with the Bergen Philharmonic Orchestra and Choir conducted by Edward Gardner on the Chandos label released in 2018.

[22] Davidsen, accompanied by pianist and fellow Norwegian Leif Ove Andsnes, sings selections from Grieg, in a recording released on Decca in 2022.