Like her sister Bonnie, Samuelson chose to play internationally for the Great Britain women's national basketball team, using her mother's nationality. She debuted for the team in February 2018, playing two games in the EuroBasket Women 2019 qualification. In November, Samuelson helped the British team win the final two games, granting them a spot in EuroBasket Women 2019. During the European tournament, Samuelson averaged 11.1 points, 4.4 assists and 2.9 rebounds as the British team finished in fourth place. She also played the Olympic Qualifying Tournament, missing the Olympic qualifying spot while averaging 10.3 points, 4.3 assists and 2 rebounds.