An R&A Scholar and University of Stirling student, Duncan has benefited from coaching by former European Tour winner Dean Robertson, who also served as her caddie during the 2021 Women's British Open.

In 2019, she was 3rd at the Scottish Women's Amateur Championship held at Kilmarnock (Barassie) Golf Club.

She was part of Great Britain and Ireland's 2021 Curtis Cup team at Conwy Golf Club and in 2022 at Merion.

After rounds of 68, 73 and 68 she was tied for fourth place, only two strokes behind joint leaders Nanna Koerstz Madsen and Anna Nordqvist.

She joined winner Anna Nordqvist at the trophy presentation to accept the Smyth Salver for low amateur.