A four-time national champion and two-time Tewaaraton Award winner, Nielsen boasts 10 years of coaching experience at the Division I level.

In her two seasons at Michigan, she has propelled the Wolverines to the best campaigns in program history. U-M went 16-4 in just Nielsen's second season at the helm, earning is first-ever appearance in the NCAA Tournament in which it hosted the first and second rounds. Furthermore, the Wolverines went 9-0 at U-M Lacrosse Stadium in the regular season and defeated six ranked opponents.

Under Nielsen's tutelage, Michigan earned its first-ever ranking in the IWLCA Coaches Poll and remained in the top-10 in the nation from week five to the end of the 2019 season. U-M also held the nation's longest winning streak in the 2019 campaign, going 13-0 to start the season to extend its win streak to 15 games. As a team, the Wolverines broke the school single-season goal record (257) tallied the most ground balls in a single game (30), ranked second in fewest turnovers in a single game (nine) and recorded the third-highest total of goals ina single game (20).

For the first time in the history of the program, Nielsen guided three players to 40-or-more points in the same seasons, while three Wolverines broke single season records. On the defensive end of the field, Michigan gave up the fewest goals (182) in program history in the 2019 campaign.

Nielsen has led four Wolverines to Big Ten honors in her first two seasons, while Mira Shane became the first Michigan player to be a nominee for the Tewaaraton Award and Molly Garrett earned a spot on the watch list in 2019. Moreover, four U-M student-athletes earned IWLCA West/Midwest All-Region Second Team honors for the first time in program history in the 2019 season.

Off the field, 19 women's lacrosse players have been named Academic All-Big Ten in Nielsen's two seasons, while four have been named Big Ten Distinguished Scholars.

An Adelaide, Australia, native, Nielsen continues to compete at the highest level as a member of the Australia women's national team. She has competed in four World Cups, most recently leading Australia to the 2017 FIL Rathbones Women’s Lacrosse World Cup semifinals. After recording seven goals and nine assists in the tournament, she was one of 12 players named to the All-World Team.