[citation needed] Cristina Ouviña Modrego began her basketball career with Basket Lupus for eight years, after which she joined the Helios Swimming Center.

She went international with the Spanish Under-16 in August 2006 and won the gold medal in the European Championship of this category, held in Košice, Slovakia.

[citation needed] On 30 June 2013, the Spanish national team, with Ouviña, won the EuroBasket gold medal against France (70–69).

After recovering from her knee injury, she continued to improve her skills and averaged 9.3 minutes, 2.9 points, 1.2 rebounds and 0.4 assists per game.

The summer had been one of the best, and she played in the European Under-20 Championship in Gdynia, Poland, where her team won the silver medal after losing to France (74–52).

CDB Zaragoza, Ouviña's team, finished the season in fourth place and participated in the play-offs for the league title against Ros Casares Valencia.

She played her last championship with the under age selections, the 2009 European U-20 in Latvia, where the Spanish team won another silver medal after losing to Russia.

She made her debut with Spain women's national basketball team at the age of 20 in 2011, although she wasn't regularly in the roster for final tournaments until 2018.