Despite struggling with severe cardiomyopathy and a recent heart failure diagnosis, Stewart was able to walk across the stage to receive her diploma, a moment her family will forever cherish. On the day of her graduation, Sienna suddenly collapsed losing consciousness. Paramedics arrived at no time, and once the teen regained consciousness, she tearfully insisted on completing her walk across the stage.Sienna, who had received a heart transplant ten years ago, had lived with severe cardiomyopathy since the age of 4 and began “getting sick” earlier this year. Following her transplant, she had live a rather normal life for ten years, but it was recently that she had started “getting weak and slowing down…