[1][2] Originally from Fayetteville, North Carolina, Sullivan spent four years at the United States Military Academy in West Point, New York, where she played on the Women's Rugby team for three and a half seasons.

[4] Growing up, she spent time in Germany, Kentucky, California, and Hawaii, but considers Fayetteville, North Carolina, home.

[5] After graduating from Jack Britt High School in Fayetteville, North Carolina, Sullivan enrolled at West Point in the fall of 2016.

[6] Sullivan joined the rugby program at the start of her freshman year at West Point and became a starter just three games in.

During her time as a Black Knight, Sullivan earned many accolades, becoming a 3x NIRA 15s All-American (2017, 2018, 2019), 2019 Prusmack Award winner, 2019 Collegiate Rugby Championship Tournament MVP, and a HSBC All-Academic Team honors, (2019–20).

At the 2022 Rugby World Cup Sevens, the team lost to France in the bronze medal match and finished fourth overall.