Ruck swam in the heats for the 4x100 m freestyle relay, but was replaced with Maggie Mac Neil in the event final. She shared in the silver medal won by the Canadian team. Ruck had the ninth-fastest time in the semi-finals of the 100 m backstroke, missing qualification to the final by 0.15 seconds. She went on to place sixth in the heats and seventh in the semi-finals of the 200 m backstroke, qualifying to her first individual Olympic final, where she placed sixth overall. Ruck expressed satisfaction with this, having noted that "this meet has been more downs than ups." Finally, Ruck performed the backstroke leg of the 4x100 m medley in the heats, helping the Canadian team to qualify in first place to the final. Kylie Masse replaced Ruck in the final, where they won the bronze medal, Ruck's second of the Games and fourth Olympic medal overall.