At the 2019 World Challenge Cup in Cluj-Napoca, Romania, Mailat won the bronze medal in the clubs, her first World Challenge Cup medal. She competed at the 2019 European Championships with Andreea Verdes where they finished 8th as a team. At the 2019 World Championships, she finished 19th in the qualification round and qualified to the all-around final. The Romanian team of Mailat, Alice Maria David, and Andreea Verdes finished in 12th place. In the all-around final, she finished 24th with a total score of 70.850.