 Complete the following phrase:  After graduating from Stanford University in 2017, Courtney began racing full-time and in her first full season in 2017 won four U23 World Cups and the U23 World Cup overall title, and took a silver medal at the U23 world championship. She is also a two-time US cross-country XC national champion, having won the title in 2017 and 2018. Courtney participated at the 