She created roles in Leonide Massine's Les Présages, Jeux d'enfants, Beau Danube, and Bronislava Nijinska's Les cent baisers. In 1940 she joined Ballet Theatre and she married Gerry Sevastianov, one of the directors. In 1946, Baronova married Cecil Tennant with whom she had three children, Victoria, Irina and Robert.
Baronova also appeared in films and musicals, was a guest artist with the Original Ballet Russe and was an active member of the Royal Academy of Dancing. She wrote an article called "Dancing for de Basil" for About the House (a magazine about the Royal Opera House at Covent Garden) in 1964. In 1974, she returned to ballet as a teacher and consultant. In 2005, she wrote her autobiography, Irina: Ballet, Life and Love. She passed away at her home in Australia on June 28, 2008 at the age of 89.