 Complete the following phrase:  In 1916, Sergei Diaghilev invited her to tour with the Ballets Russes in the United States, where she danced with Vaslav Nijinsky in Le Spectre de la Rose, Les Sylphides and the Bluebird pas de deux from The Sleeping Beauty. In 1918 she returned to the Mariinsky, renamed the Petrograd Opera and Ballet Theater after the 