[2] When she was 14 years old she was selected into the national training centre for juniors within the Petrache Trișcu sports high school in Craiova under Dan Podeanu's coaching.

They defeated Hungary by a single hit in the final, winning the first European title in the history of Romanian épée fencing.

With Ana Maria Brânză, Loredana Dinu and Simona Gherman, Măroiu won the 2010 World Championships in Paris after they defeated Germany in the final.

[6] After seeing off Ukraine's Olena Kryvytska and Russia's Anna Sivkova she fell to South Korea's Shin A-lam in the quarter-finals.

In the team event, top seeded Romania suffered a surprise defeat to South Korea and finished sixth after the placement matches.