[4] Following her debut game for the Blues, she was selected for the W-League team of the week as a result of scoring two goals against Ventura County Fusion.

In 2009, McCallum played for Sky Blue FC in the new Women's Professional Soccer in the United States.

Following the retirements of Cheryl Salisbury and Joanne Peters in February 2010, she was named the Matildas vice captain.

Such is her legacy at youth level that in 2019 Professional Footballers Australia named the Australian Young Player of the Year award the Collette McCallum Medal in her honour.

The 132nd capped Matilda played every Australian fixture at the 2007 FIFA Women’s World Cup (China 2007) & 2011 FIFA Women’s World Cup (Germany 2011) helping the team reach the quarter finals in each tournament.