In August 2018 she participated in the European Championships in Glasgow. The French team earned a silver medal in the team final, finishing behind the Russians and ahead of the Dutch. Mélanie qualified for two event finals, finishing in sixth place on beam, and winning gold on floor. She became the third French gymnast to win this title at the European Championships after Ludivine Furnon in 2000 and Isabelle Séverino in 2005. At the 2018 World Challenge Cup in Paris, she won the gold medal on floor exercise.