[6] In February 2020, Montero and her Herediano teammate María José Morales joined Superliga Femenina side Liga Deportiva Juvenil de Macas on a seven-month loan.

[10] In July 2021, Montero signed with Liga MX Femenil side Cruz Azul, becoming the team's first foreign player.

[12] Montero represented Costa Rica in the 2014 CONCACAF Women's U-20 Championship, scoring in the third-place playoff against Trinidad and Tobago.

[13] She was later included in Costa Rica's squad for the 2014 FIFA U-20 Women's World Cup, scoring in a 5–1 loss to France.

[14] Montero made her senior debut for Costa Rica on 30 November 2021, scoring in a 5–2 friendly win against Nicaragua.