[15] Competing as part of the Canadian team for the 2019 World Aquatics Championships in Gwangju, she won bronze medals in the 4x100 m and 4x200 m freestyle relays.

[16] She won a silver medal as part of the Canadian team in the 4x100 m freestyle relay, alongside Maggie Mac Neil, Rebecca Smith, and Penny Oleksiak.

[19] Sanchez announced plans to study political science at the University of British Columbia beginning in January 2022, following the completion of the ISL's third season.

[13][20] The season concluded at the 2021 World Swimming Championships, where Sanchez won four medals (three gold and one silver) as part of Canadian relay teams.

She recorded a personal best relay split time of 52.52 as part of the Canadian team's silver medal win.

She, Oleksiak and Summer McIntosh jointly set a record at the championships for most medals by a Canadian swimmer at a single edition, with four each.

[5] World Aquatics would approve Sanchez's sporting nationality change, enabling her to compete for the Philippines from 6 July 2023 onwards.