Second-place Wei Yun-jye of Taiwan, who trailed the Australian by one shot after the second round and played with Webb in the final group Saturday, had a 1-under 71 and was one of only seven golfers to break par in tough windy conditions.
Webb has a three-round total of 10-under 206.
'If we have similar conditions tomorrow it's still a course that can give up big numbers,' she said. 'So I just hope to have the same sort of focus that I had today and trust in my game and hit similar shots.'
Sarah Kemp of Australia, who led after the first round with a 66 but had a 78 Friday, shot a 71 Saturday and is alone in third place at 1-under 215.
'The wind picked up a lot more than the last couple of days and that made it a bit harder,' Kemp said. 'The greens are still really quick and it was tough. A lot tougher than the last couple of days.'
Marta Prieto of Spain and Virginie Lagoutte-Clement of France, each with 72s, and Ahn Sun-ju of South Korea (74), are in a three-way tie for fourth at even-par 216.
American Natalie Gulbis shot 72 to remain at 5 over on the tournament. Laura Davies of Britain, who won the Australian Open the last time it was played in 2004, had a 74 and is 8 over.
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