Four years later, Leier qualified for her second Canadian team, as a 27-year-old, at the 2004 Summer Olympics in Athens, by breaking a Canadian record and attaining an A-standard time of 1:08.14 from the Olympic trials. She finished twelfth overall in the semifinals of the women's 100 m breaststroke by a hundredth of a second (0.01) behind her teammate Lauren van Oosten, outside the Canadian record time of 1:09.46.