Loncki had a storybook ending to her CMS career, winning the individual national title at the 2018 NCAA Women's Golf Championships, while leading the Athenas to their first-ever team title in the process. Loncki captured the individual title over the first 72 holes, which resulted in a tie between CMS and Williams. Then on the second playoff hole, she sank a 15-foot birdie putt that proved to be the difference in the Athenas winning the national title. Loncki also finished fifth in the NCAA Championships as a junior, and was a member of the Athenas soccer team for four seasons as well.