[6] She played soccer, volleyball, and track at Cathedral High School in Hamilton, Ontario.

She played on the school's soccer team, but she was sidelined her first year due to an anterior cruciate ligament injury.

In 2014, she was allocated to the expansion Houston Dash by Canadian national team coach John Herdman, but was traded to the Chicago Red Stars for fellow Canadian international Erin McLeod before the Dash's expansion draft.

Tancredi made her debut with Canada as a central back, starting in all five games of the 2004 Olympic qualifying tournament in Costa Rica.

Tancredi had previously been invited to play with the Canadian national team at the 2000 Algarve Cup in Portugal.

Tancredi was part of the Canadian team that finished second to the United States at the 2006 CONCACAF Women's Gold Cup.

[12][13][14] Tancredi competed for team Canada in three World Cup final tournaments: 2007, 2011 and 2015; and three Olympics: Beijing 2008, London 2012, and Rio 2016.

Tancredi scored both goals in a 2–1 win against Germany on the third match day of the 2016 Rio Olympics to put Canada at the top of their group.