Knight was also capped for Wales at the Under 20 level. Although she was due to earn her first international cap at the 2014 Women's Six Nations Championship, during pregnancy, Knight vowed to play for the senior team sometime in the future; she feared that would affect her career adversely. Knight asked a coach to draw up a fitness programme that was altered with each semester. She was shortlisted for the Wales women's national team side for the 2018 Women's Six Nations Championship. Knight made her debut for the Wales national team in a Six Nations match against Scotland and she has gone to be capped a total of six times in her career.