 Over the next two years, Blackwell was inconsistent at international level and was in and out of the team due to poor performance.However, she was able to maintain her position for the 2005 World Cup in South Africa, playing in all but one match as Australia won the tournament without a loss.Playing in the middle-order, she was not required to bat often as the opposition rarely broke through the Australian batting, making 67 runs at 33.50.