In 2012, Lacoste won the Canadian national title, defeating Cynthia Phaneuf by 1.57 points. Lacoste then earned a berth to her second World Championships when she placed 7th at the 2012 Four Continents, 0.18 ahead of Phaneuf. She finished 16th at the 2012 World Championships in Nice. Lacoste injured her right hip in autumn 2012.