Charlton, the winning Victorian team captain at the Interstate Series in Melbourne recently, was seeded 16th after the strokeplay section at Portstewart Golf Club.
Last night she defeated Ireland's Lisa Maguire 4 and 3, then toppled Italian Lucrezia Colombotto Ross 3 and 2 in the second round to reach tonight's third round.
The challenges grow stronger for the Metropolitan Golf Club member though. She is drawn to play the world's No. 1 amateur, Leona Maguire, in the round of 16.
Maguire, who is on scholarship at Duke University in the United States, has been by far the dominant player at Portstewart, easily winning the strokeplay section and then shooting six-under par for 12 holes in the first round of matchplay.
The winner progresses to the quarter-finals.