After taking part in a training camp with the Mexico Under-20 National Team in July 2011, Romero was selected to be part of the Mexico National Team that competed at the CONCACAF Women's Olympic Qualifying Tournament in Vancouver, British Columbia, in January 2012.
 She was also on the Mexico U-20 team that competed at the CONCACAF Championships in Panama City, Panama, in February 2012.
Romero started all four of Mexico's games at the tournament, playing 360 minutes.
She helped Mexico reach the quarterfinals for the second time at the 16-team tournament.

In the spring of 2013, Romero played in the Algarve Cup with the Mexico National team in Portugal.
Mexico was one of 12 countries invited to the tournament and started in group play with Hungary, Wales and Portugal.
Romero played in three of Mexico's four games, including a start against Wales during group play.
Mexico won their group with a pair of wins over Hungary (1–0) and Portugal (3–0), which placed them in the seventh-place game at the tournament but lost to Denmark 3–0.
Mexico played in the tournament for just the third time in tournament history and the first time since 2006.

Romero was one of four collegians to be called up for Mexico's women's nationally-televised international friendly against the United States of America in Washington, D.C. at RFK Stadium on Tuesday, 3 Sept.. Romero started and played the entire match on a young back line for Mexico.
After taking part in a training camp with the Mexico Under-20 National Team in July 2011, Romero was selected to be part of the Mexico National Team that competed at the CONCACAF Women's Olympic Qualifying Tournament in Vancouver, British Columbia, in January 2012.  She was also on the Mexico U-20 team that competed at the CONCACAF Championships in Panama City, Panama, in February 2012. Romero started all four of Mexico's games at the tournament, playing 360 minutes. She helped Mexico reach the quarterfinals for the second time at the 16-team tournament.
In the spring of 2013, Romero played in the Algarve Cup with the Mexico National team in Portugal. Mexico was one of 12 countries invited to the tournament and started in group play with Hungary, Wales and Portugal. Romero played in three of Mexico's four games, including a start against Wales during group play. Mexico won their group with a pair of wins over Hungary (1–0) and Portugal (3–0), which placed them in the seventh-place game at the tournament but lost to Denmark 3–0. Mexico played in the tournament for just the third time in tournament history and the first time since 2006.
Romero was one of four collegians to be called up for Mexico's women's nationally-televised international friendly against the United States of America in Washington, D.C. at RFK Stadium on Tuesday, 3 Sept.. Romero started and played the entire match on a young back line for Mexico.
Arianna Romero