Justina arrived at River Plate at the age of 11.[4] In 2015, she made her debut with the club's first team and scored 2 goals in a 24–0 victory against Almagro.[4] Justina continue her grow at the club and in 2022 was named team captain.[5] On 25 June 2023 she played her last game with River Plate a 2–1 victory against Estudiantes (LP).[6]