As member of the Spain women's national gymnastics team, she competed at the 2013, 2014, 2015 and 2019 World Championships, as well as the 2020 Summer Olympics.

[5] After she was finally cleared to compete for Spain, she sustained an elbow injury training on uneven bars, which required two surgeries and intensive rehab, leaving her out of competition for a few years.

[12] After the World Championships, she won the all-around gold medal at the Mexico Open ahead of Americans Maggie Nichols and Peyton Ernst.

[17] At the Tokyo World Cup, she finished in second place behind Vanessa Ferrari of Italy after falling off the balance beam.

[18] Later that month she competed at a friendly meet against gymnasts from Great Britain and Germany, winning all-around gold and team bronze.

[20] A few weeks later, she competed at the European Championships, placing sixth with her team, seventh on floor exercise, and eighth on uneven bars.

[21] Then in July, she competed at the Spanish Nationals, winning the all-around title and gold on every individual event except balance beam, where she won silver.

[24] She was scheduled to compete at the Mexico Open and was considered the front-runner to win, but suffered a knee injury in training the morning of the competition and withdrew.

The Spanish team finished fourth, and Popa had the third-highest score on the uneven bars behind Jessica López and Larisa Iordache.

[37] Popa made her international comeback at the Szombathely Challenge Cup where she won bronze on the uneven bars.

[39] At the 2019 World Championships, Popa, alongside teammates Cintia Rodríguez, Alba Petisco, Ana Pérez, and Marina González, finished twelfth as a team during qualifications.

[45] She was selected to the Spanish women's artistic gymnastics team for the postponed 2020 Summer Olympics alongside Marina González, Alba Petisco and Laura Bechdejú.

[48] After the Olympic Games, Popa competed at the 2nd Spanish League where she had the highest scores on the vault, uneven bars, and balance beam and helped her club win the silver medal.

[53] Then in February 2023, she competed on the uneven bars and balance beam at the 2nd Spanish League, helping her club finish fourth.