Sloan played third for Eve Muirhead's junior rink, winning the 2009 World Junior Curling Championships for Scotland. In 2010, she won a silver medal at the European Championships as alternate to the Muirhead rink. At the same time, Sloan skipped her own ladies rink and defeated Muirhead's separate ladies rink en route to the 2011 Scottish championship, defeating Hannah Fleming in the final. Before representing Scotland at her first World Championship, she won a second World Junior Championship playing third for the Muirhead junior rink. Two weeks later at the World Championships, she skipped Scotland to a ninth-place finish. In addition, Sloan has skipped Great Britain to gold medals at the 2009 European Youth Olympic Winter Festival and the 2011 Winter Universiade.