At the age of 12, Celia was no longer allowed to play on boys' teams and left to join the girls' academy at Real Jaén.

[2] She debuted for the senior team of FCF Atlético Jiennense, Jaén's female affiliate, during the 2009–10 Superliga Femenina season, becoming the youngest Spanish first division player at the age of 14.

[5] She suffered a season-ending knee injury in 2016 preseason and considered retiring but, having spent a redshirt year focusing on her studies, returned in 2017 to make 20 appearances and earned All-SEC first-team honours.

After graduating in June 2018, Celia trained full-time with Reign FC while playing for Women's Premier Soccer League side Seattle Sounders during the remainder of the 2018 WPSL season, scoring the winning goal in the Championship final.

[11] In her first season with the team, Celia made 13 appearances including 10 starts and scored once, the only goal in a 1–0 win over derby rivals Portland Thorns FC.

[10] With the 2020 NWSL season disrupted by the COVID-19 pandemic, Celia played for the newly rebranded OL Reign during the 2020 NWSL Challenge Cup before missing the four-game friendly Fall Series to join Division 1 Féminine side and sister club of the OL Reign, Olympique Lyonnais, on loan until June 2021.

Ahead of the 2021 season, Celia also received a permanent resident green card meaning she no longer occupied an NWSL international roster spot.

[5] Celia made her senior international debut aged 19 on 17 September 2014, starting against the Czech Republic during 2015 FIFA Women's World Cup qualification but had to be substituted after 25 minutes with an injury.

[10] In 2017, Celia was named to her second successive major tournament squad as Spain contested the UEFA Women's Euro 2017.