In 2007, Pettitt played in the 2007 World Netball Championships and played in either Goal Attack or Goal Shooter. In the grand final against the New Zealand national netball team, Pettitt was called to play in the second half replacing Sharelle McMahon, a surprise move by Norma Plummer to help improve on the team's accuracy. This went very well until Pettitt got a concussion which she was benched during the fourth quarter. Her contribution was enough for Australia to win the 2007 World Netball Championships. Pettitt was selected into the Diamonds squad in 2010 heading into the Commonwealth Games in India. She did not play in the Grand Final against the New Zealand national netball team. However, she did get court time against Samoa and shot 25/27 (93%), India and shot 39/42 (93%), Malawi and shot 36/39 (92%) and Trinidad and Tobago and shot 17/21 (81%). Pettitt did not get selected into the 2011 World Netball Championships Squad, a huge blow for her with the likes of Erin Bell with her versatility in GS, GA and WA making it in front of Susan Pettitt. In November 2011, Pettitt entered the Australian Fastnet Diamonds going into the 3rd Fastnet Series in Liverpool, England and was announced co-captain alongside Bianca Chatfield.