After 36 holes, Robyn Choi from RACV Royal Pines in Queensland, leads the Rene Erichsen Salver by two strokes, after rounds of 71,72 to be 3-under the card.
Choi who turned 18 last week, fired four birdies again in the second round, on holes two, four, nine and 15, but struggled on the 18th, again making bogey.
Choi said she will have one eye on her opposition in round three, but also try and focus on the play ahead.
Shina Kanazawa (Japan) and Olivia Kline (Vic), the later firing the low round of the day, a four-under 69 and South Australian Elysia Yap (Glenelg) are in a three-way tie for second at one-under.
Yap was surprised with her form, which included four birdies today, three on the back nine.
“It’s the first time I have been under par at a major tournament” Yap said.
Fourteen-year-old South Australian Jin-young Yun is in outright fifth at one-over, after rounds of 75, 72.
Kristalle Blum from The Grange is in a tie for sixth at 2-over after rounds of 76, 72.
“I hit it really well, left a few out there with a couple of three putts for par, but all in all, I was pretty happy with how I played and how I hit it, so can’t be too unhappy with one-under,” Blum said.
24 players progress through to the third round on Wednesday.