2016 Olympic Trials
Sullivan finished 12th in the 800 freestyle at the 2016 Olympic Trials as a 16 year old.
2017 Winter Nationals
Sullivan finished second in the 1650y free and third in the 500y free at Winter Nationals.
2018 U.S. Open Water Championships
The 2017 Junior National Champion in the 5K won the U.S. Open Water National women’s 5K title in 58:18.168 and finished third in the 10K.
2018 U.S. National Championships
Sullivan earned the bronze in the 1500 freestyle (16:02.88), getting her a spot on the 2018 Pan Pac team, her first ever USA “A” team. She also fifth in the 800 freestyle (8:26.98), 37th in the 200 backstroke (2:14.45), and 39th in the 400 IM (4:53.60) at the Phillips 66 National Championships.