In February 2018, Grant received her first senior call-up by the Scotland national team. On 6 March 2018, she made her senior debut in a 2–0 victory over New Zealand. Grant made her first senior level competitive appearance during Euro 2021 qualifying, in an 8–0 victory over Cyprus at Easter Road on 30 September 2019. She scored her first international goal during the 2020 Pinatar Cup, in a 1–0 victory against Iceland.
