Hywel was called up to the Wales women's under-16 national rugby union team once, but wasn't selected for any games. After being picked for the Wales women's national rugby union team at the 2013 Women's Six Nations Championship, she made her debut as a substitute against Ireland for the final five minutes of the game. She made her full debut a short while later with a start against France at the Stadium Marcel Levindrey, Laon.