Fontanilla played for the varsity women's football (soccer) team of Norco High School under head coach Daniel Graffa. She was a two-year varsity letterwinner. In her senior season in 2017, she led her team to the California Interscholastic Federation. She also played for local soccer club Arsenal FC where she helped make it to six consecutive editions of the Surf Cup from 2013 to 2018.[4]
College career
As a freshman, Fontanilla played for the Northwestern Oklahoma State Rangers. She became part of the Cal State Fullerton Titans women's soccer team for the 2019 season. She redshirted for her sophomore season. She was part of the Titans squad which won the Big West regular season Conference Championship and Tournament Championship. In the 2020 season, she joined the Eastern Oregon University Mountaineers.[4] In 2022, she transferred to a school in Southern California so she could focus on her club soccer career.[8]
Club career
In 2023, Fontanilla began playing for the Central Coast Mariners.[9] She is a top-ranked goalkeeper in the FNSW Women's League One.[9]
In July 2024, after weeks of training with the team, the club officially announced the signing of the Philippines international goalkeeper, along with compatriot Rhea Chan.
International career
Fontanilla is eligible to represent the Philippines through her Filipino father.[11] However, she had to secure Filipino citizenship for herself and her father who has not been in the Philippines for the past 40 years.[12] She is part of the Philippines squad which participated in the 2022 AFC Women's Asian Cup in India. A third-choice keeper for the tournament,[13] she made her senior national team debut in the Philippines' 0–4 loss to Australia.[14]
Fontanilla was named a member of the Philippines women's national team for the 2023 FIFA World Cup.[15]
^Vasavda, Mihir (January 25, 2022). "How virus dashed hopes, broke hearts of Indian women footballers". The Indian Express. Retrieved January 25, 2022. Stajcic said the Philippines were forced to play without one of their 'key players' and fielded their 'number three goalkeeper' (Fontanilla) for their Group B match against Australia