Gadéa is known for her leadership ability and has, subsequently, captained several of her age groups in international competition. She has represented France at under-17, under-19, and under-20 level. With the under-20 team, she played in the 2010 FIFA U-20 Women's World Cup. Her most notable moment in the competition came in a group stage match against Germany. With France trailing 4–1 in the second half, following a free kick, Gadéa received the ball and took a chipped, driven shot straight at the goal. The ball went into the back of the net before bouncing back out, however no goal was given by the referee. France lost the match by the same scoreline and were eliminated from the competition by goal difference. The non-call was similar to what happened the previous month at the 2010 FIFA World Cup in a match against England and Germany, which led to calls for the introduction of goal-line technology.