[4] Manilla and Cooperrider played doubles together and finished 2nd to Mexicans Montserrat Mejia and Andrea Ramirez in a seven team round robin competition.

[5] At the 2014 World Junior Championships in Cali, Colombia, Manilla lost in the quarterfinals of Girls U16 Singles to Costa Rican Melania Sauma, 15–5, 15–7.

[7] Manilla played at the 2015 World Junior Championships in Santo Domingo, Dominican Republic, where she lost in the quarterfinals of Girls U16 Singles to Gabriela Martinez, 15–11, 15–9.

[9] Manilla won Girls U18 Singles at the 2016 World Junior Championships in San Luis Potosi, Mexico, where she beat Melania Sauma of Costa Rica, 15–3, 15–13, in the final after defeating team-mate Jordan Cooperrider in the semi-finals, 15–9, 13–15, 11–7.

[11] The 2016 USAR National Singles Championships were in Highlands Ranch, Colorado, close to Manilla's home, so she played in them, losing in the quarterfinals to Cheryl Gudinas, 15–12, 8–15, 11–4.

[12] Manilla went to college at Northern Arizona University, and represented them in the 2017 USAR Intercollegiate Championships in Fountain Valley, California, where she and Erin Boadway defeated Carla Muñoz and Samantha Baker of Colorado State at Pueblo to win Women's Doubles, 15–10, 15–12.

[18] In 2019, Manilla teamed up with Hollie Scott for the USAR National Doubles Championships in Tempe, Arizona, where they lost to Danielle Maddux and Michelle De La Rosa, 15–9, 15–10, in the quarterfinals.

[21] Manilla was in the draw for the 2019 USAR National Singles Championships in Highlands Ranch, Colorado, but she forfeited her first match against Cheryl Gudinas in the quarterfinals.

[25] The doubles win should have put Manilla on Team USA for the 2020 World Championships, but then the COVID-19 pandemic happened, and international racquetball events were cancelled or suspended.

At the 2021 USA Racquetball National Team qualifying event in Des Moines, Iowa, Manilla lost in the semi-finals of Women's Singles to Kelani Lawrence, 15–13, 15–6, and then won the 3rd place match against Hollie Scott, 15–14, 15–11.

[37] At the 2022 Racquetball World Championships in San Luis Potosi, Mexico, Manilla played Women's Singles, losing to Bolivian Angélica Barrios in the quarterfinals, 11–6, 11–9, 5–11, 11–7.

In Women's Doubles, she and Michelle Key defeated Lawrence and Hollie Scott, 7–11, 11–4, 11–6, 11–7, in the final, after beating Sheryl Lotts and Rhonda Rajsich in the semi-finals, 11–8, 11–5, 11–6.

She and brother Adam Manilla beat Argentina's Diego Garcia and Maria Jose Vargas, 11–4, 11–4, 11–6,[44] in the final, after defeating Mexicans Paola Longoria and Eduardo Portillo, 11–9, 13–11, 6–11, 8–11, 11–7, in the semi-finals.

[52] Manilla has represented the USA internationally several times, and her highlight is a gold medal in Mixed Doubles with her brother Adam at the 2023 Pan American Games in Santiago, Chile.