[12] In March 2016, Malabuyo made her international debut as part of the United States' gold-winning junior team at the 2016 L'International Gymnix tournament.

[15] In June, Malabuyo competed at the 2016 Secret U.S. Classic, where she finished second in the all-around behind fellow Texan Irina Alexeeva of World Olympic Gymnastics Academy (WOGA) and third on balance beam.

[16] In April 2017, Malabuyo competed at the City of Jesolo Trophy, where she finished third in the all-around behind teammates Gabby Perea and Maile O'Keefe.

[20] Malabuyo made her senior debut at the City of Jesolo Trophy, where she competed as an individual alongside club teammate Ragan Smith.

In August she traveled with Smith to Boston to compete in the national championships, but pulled out of the event during training to avoid re-aggravating her injury.

In February Malabuyo was named to the team to compete at the City of Jesolo Trophy alongside Sunisa Lee, Shilese Jones, and Gabby Perea.

[26] In Italy she helped the USA win gold in the team final, and individually won bronze in the all-around behind Lee and Liu Tingting of China,[27] and won silver on balance beam behind reigning World Champion Liu and on floor exercise, behind teammate Lee.

During event finals Malabuyo won silver on floor exercise, the highest ever result for a Filipina gymnast at the Asian Championships at that time,[8] and placed fifth on balance beam.

[36] In early 2024 Malabuyo competed at the Cairo World Cup where she won silver on floor exercise behind Mana Okamura of Japan.

In late May she competed at the Asian Championships where she won bronze in the all-around behind Hu Jiafei and Qin Xinyi, both from China.