In 2016, she was officially named to Canada's Olympic team for the 2016 Summer Olympics. Despite being hampered by a hamstring injury, Overholt qualified for the 400 m medley final and finished fifth. Despite thinking her Olympic participation was over, when Brittany MacLean could not attend the 4 × 200 m relay qualifying heats due to illness, Overholt was called in to replace her and helped the team reach the finals. Canada went on to win a bronze medal. After returning to Canada, Overholt struggled with heavy depression, being hospitalized until December, and only returned to competition in an UBC meet in January. She was then absent from the U Sports season and the Team Canada trials for the 2017 World Championship for not having fully overcome the hamstring injury. By November, Overholt was fully fit and swimming for the Thunderbirds. She has since won two straight U Sports swimming championships for the Thunderbirds, winning all four races she entered in the 2019 meet. In her return to the Pan Pacifics in Tokyo 2018, Overholt finished fifth in both the 400m freestyle and individual medley. In the 2019 World Aquatics Championships, Overholt finished fifth on the 400m medley and got a bronze in the 4 × 200 m relay.