In back-to-back years, 2014 and 2015, Aitken skipped her team to victory at the Scottish Junior Championships, with teammates Naomi Brown, Rowena Kerr, and Rachel Hannen. At the 2014 World Junior Curling Championships Aitken's team finished the round robin with a 3–6 record, missing the playoffs. Returning to the World Juniors in 2015, they found much more success. Aitken and Team Scotland finished the round robin in second place with a 6–3 record. In the page playoffs, Team Scotland defeated the number one seeded Canada in the 1 vs. 2 game and Sweden in the semifinals, thus setting up a rematch with Team Canada in the final. In the final, Canada, skipped by Kelsey Rocque, got their revenge, defeating Scotland 8–2. Earlier in the 2014–2015 season, Aitken and her juniors team also won bronze at the Scottish Women's Curling Championship, Aitken's best finish at that championship.