After graduating in 1951, Shivas moved to London to work at Hammersmith Hospital but continued her running by joining the Spartan Ladies Athletics Club. The following year she was selected to compete in the 100 metres at the 1952 Summer Olympics held in Helsinki, Finland, where she ran a time of 12.5 seconds and finished third in her heat behind Shirley Strickland and Vera Krepkina but didn't qualify for the next round. After fulfilling her Olympic dream, she then retired from athletics.