She played college soccer for the Notre Dame Fighting Irish before being selected by the Reign in the second round of the 2024 NWSL Draft.
[6][3] She played in all 23 of the Fighting Irish's matches as the team advanced to the quarterfinals of the 2022 NCAA Division I women's soccer tournament for the first time in a decade.
[7] On the way to the quarterfinals, Mercado scored in the team's opening round victory over Omaha and in their round-of-16 match versus TCU.
[14] Mercado's next minutes with the Reign occurred during the 2024 NWSL x Liga MX Femenil Summer Cup, where she started the club's first two games.
[21][22] As part of the United States women's national under-19 soccer team, Mercado was named to the squad for the 2020 La Manga Tournament.