McIsaac quit singles in 2017 to focus on training ice dance full-time. She teamed up with Elliott Graham and moved to train with his coaches at the Mariposa School of Skating in Barrie, Ontario. McIsaac/Graham made their junior international debut at 2017 JGP Poland, where they finished fourth. They then won Sectionals and medaled at Skate Canada Challenge to qualify to the 2018 Canadian Championships. At Canadian Championships, McIsaac/Graham won the silver medal behind Marjorie Lajoie / Zachary Lagha and were named to the team for Junior Worlds in their first season as a team.