 Ferrell competed for the United States at the 1968 Summer Olympics held in Mexico City, Mexico in the 100 metres, where she finished second to teammate and 1964 gold medalist Wyomia Tyus.She finished fourth in the 200 metres final.The two then joined together with fellow Americans Margaret Bailes and Mildrette Netter to take the gold medal in the 4 × 100 m relay.