College Plummer was heavily recruited out of high school, getting her first scholarship offer in the 7th grade. She ultimately selected
Stanford on a full athletic scholarship. While at Stanford, she helped Stanford win
NCAA national championships in
2016,
2018 and
2019. She was named to the NCAA all-tournament team all three years, and won the Most Outstanding Player award in 2018 and 2019. As a freshman, she won National Freshman of the Year by the
AVCA, and in 2017 and 2018 she was named the National Player of the Year. She made her
Serie A debut on January 19 in Monza's 3-2 defeat against
Zanetti Bergamo in which she came on as a substitute and scored 9 points. She was the top scorer in Monza's
Coppa Italia quarter final upset over
Igor Gorgonzola Novara and played a key role for her team to reach their second-ever Coppa Italia final four, where they were eventually defeated by
Unet E-Work Busto Arsizio in the semi-finals. In
CEV Cup, Plummer only played in Monza's 3-1 loss in the second leg of the round of 16 match-up against
Dinamo Kazan which eliminated them from the competition. On October 2, 2020, Plummer signed with
Denso Airybees. On June 18, 2021, Plummer signed with
Imoco Volley. On 10 May 2024, Turkish club
Eczacıbaşı Dynavit announced the addition of Plummer to their roster.
USA National Team In May 2021, Plummer was named to the 18-player roster for the
FIVB Volleyball Nations League tournament. that was played May 25-June 24 in
Rimini, Italy. She led the team with 14 kills and two blocks in her debut, when they swept
Dominican Republic in team USA's opening match. She was selected as an Olympic alternate for the
2020 Summer Olympics. She was named to the Olympic team for the
2024 Summer Olympics. During Plummer's time at the 2024 Summer Olympics, Plummer had scored 26 points, including 23 kills with one of them being the final swing to win the game during the semifinals. This helped the United States defeat Brazil and advance to the finals, where she helped her team win a Silver Medal. ==Awards and honors==