During her time with the troupe, Krassovska worked closely with Mikhail Fokine, the well-known choreographer and reformer of conventional ballet traditions.

Fokine personally coached her for roles in Les Sylphides, Le Spectre de la Rose and other ballets.

During World War II, Ballet Russe de Monte Carlo moved its home base to New York[3] and toured primarily in the U.S. and Canada.

In 1948, she premiered Pas de Quatre at the New York Met, alongside Alicia Markova, Alexandra Danilova and Mia Slavenska.

She learned tap dancing for her character in The New Yorker, Leonide Massine's 1940 ballet based on cartoons from the popular magazine.

For Capriccio Espagnol, another Massine work, Krassovska and the cast were required to execute Flamenco steps such as the bulerías and seguidilla.

When Alicia Markova and Anton Dolin decided to found the London Festival Ballet in 1950, they asked her to be the second ballerina, partnering with English dancer John Gilpin.

Having toured the country a number of times, she decided that Dallas, Texas, with its flowers, trees and pleasant climate was one of the nicest cities.

Krassovska was invited frequently as a guest teacher and coach throughout the Southeastern U.S. She danced in local productions of The Nutcracker into her 80s and produced her last concert, Tribute to Ballet Russe, at Southern Methodist University in 1997.

[5] In 1941 and 1942, while a member of the Ballet Russe de Monte Carlo, Krassovska appeared in two movies choreographed by Massine, Spanish Fiesta (an adaptation of Capriccio Espagnol) and The Gay Parisian (also known as Gaité Parisienne).

For the 1953 film Never Let Me Go, Krassovska doubled in long shots for Gene Tierney in her role as a Russian ballet dancer.