Grant has represented the Republic of Ireland at under-15, under-17, under-19, university and senior level. In 2010, together with Megan Campbell, Dora Gorman, Denise O'Sullivan, Siobhán Killeen and Clare Shine, she was a member of the Republic of Ireland U-17 squad that were runners-up in the 2010 UEFA Women's Under-17 Championship and quarter-finalists in the 2010 FIFA U-17 Women's World Cup. In December 2011, together with Dora Gorman, Megan Campbell, Julie-Ann Russell, Louise Quinn, Grace Murray and Karen Duggan, Grant was included in an FAI scholarship programme for potential senior women's internationals. Grant made her senior international debut in November 2012, in a 5–0 friendly defeat to the United States, replacing Niamh Fahey in the 57th minute. She has subsequently represented the Republic of Ireland in the 2013 and 2014 Cyprus Cups and in their 2015 FIFA Women's World Cup and UEFA Women's Euro 2017 qualifying campaigns. Grant also represented Ireland at the 2013 and 2015 Summer Universiades.