McIntyre joined the British Sailing Team at the age of 15. In 2014, the pair won the
US Sailing's Miami Olympic Classes Regatta. McIntyre won multiple medals at the
2015 ISAF Sailing World Cup. McIntyre and Weguelin came third at the 2015
470 European Championships. McIntyre and Mills came second at the
2017 470 World Championships, In 2019, McIntyre and Mills won a gold medal at the 470 World Championships, came second at the Olympic test event in
Enoshima, Japan, and came second at the 2019 470 European Championships. In October 2019, McIntyre was awarded a place in the
470 event at the
2020 Summer Olympics, alongside Mills. During the
COVID-19 pandemic, McIntyre and Mills trained in
Lanzarote in the
Canary Islands, as well as at the
Weymouth and Portland National Sailing Academy. McIntyre won the gold medal alongside Mills at the delayed 2020 Summer Olympics. The pair were ahead going into the medal race, where they needed to finish seventh or higher to win the gold medal. They eventually finished fifth in that race. In December 2021, McIntyre and Mills won the
World Sailor of the Year Awards. In 2022, McIntyre started competing with
Martin Wrigley, as the 470 events at the
2024 Summer Olympics were mixed-gender. In February 2023, McIntyre announced her retirement from sailing. ==Honours==