Having won four Ontario University Athletics conference titles (2002, 2004–06), she was part of the Golden Hawks team that claimed the CIS National Championship in 2005.

Among the highlights of her time with the Chiefs, she competed in the inaugural CWHL season (2007–08) and earned a gold medal at the 2008 Esso women's hockey nationals.

[7] Stephenson and teammate Kate Psota have both participated with the Canadian national women's baseball team in every IBAF World Cup between 2004 and 2018.

During the 2010 International Series in Cary, North Carolina, Ashley logged a .444 batting average as Canada prevailed in 4 out of 6 games against the United States.

In 2011, she would be recognized for her contributions to the national team as the recipient of Baseball Canada's Jimmy Rattlesnake Award, which in recent years was renamed in her honour.