Plummer was heavily recruited out of high school, getting her first scholarship offer in the 7th grade.[5] She ultimately selected
Stanford on a full athletic scholarship.[6] 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.[1]
On December 30, 2019, Plummer signed her first professional contract with Italian side
Saugella Team Monza.[7] 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.[8] 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,[9] where they were eventually defeated by
Unet E-Work Busto Arsizio in the semi-finals.[10] 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.[11][12] On October 2, 2020, Plummer signed with the
Denso Airybees.[13] On June 18, 2021, Plummer signed with
Imoco Volley.[14]
USA National Team
In May 2021, Plummer was named to the 18-player roster for the
FIVB Volleyball Nations League tournament.[15] 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.[16]