Émilie Dequenne, who won best actress at age 17 at the Cannes Film Festival for her role in the Belgian film “Rosetta,” died on Sunday at the Gustave Roussy hospital in Villejuif, France. She was 43. Her death was confirmed…

Émilie Dequenne, who won best actress at age 17 at the Cannes Film Festival for her role in the Belgian film “Rosetta,” died on Sunday at the Gustave Roussy hospital in Villejuif, France. She was 43. Her death was confirmed…