Lembach was first called into the French national team for the 2009 European Championships in Plovdiv, but a hamstring injury prevented her from attending the competition.

The 2012–13 season saw her breakthrough: at Tianjin she climbed on the podium of a World Cup event, which no other French sportswomen had accomplished in two years and a half.

In the 2013–14 season Jean-Philippe Daurelle replaced Cyril Tahon as coach of the French women's sabre team, which Lembach described as “a breath of fresh air”.

[4] In the European Championships held in her native Strasbourg, Lembach defeated teammate Cécilia Berder, but failed in the second round against No.1 seed Vassiliki Vougiouka and finished 13th.

Their winning streak was snapped in the final by the United States led by twice-Olympic champion Mariel Zagunis and France came away with a silver medal.