Shankland first played for Scotland in the disrupted 2020 Women's Six Nations Championship. The winger scored a late try, which was converted by Helen Nelson, in her debut appearance for Scotland against France in a match that saw the side draw with their opponents 13-13. This was considered significant progress for the Scottish team, whose opponents were the 2018 Women's Six Nations victors. In an interview with her local newspaper, The Cumnock Chronicle, she said of the experience,"“It was incredible. The whole thing of being selected and named in the starting squad right through to getting the draw and it being a victory for us, it was quite surreal and really exciting. It was hugely positive for the team as a whole and really exciting in terms of the progress we’ve made and how much we’re moving forward.”" The side returned to action with Shankland a new addition after COVID-19 disrupted the year's championship.