Moriya Jutanugarn, of Thailand, is second, while tied for third, three shots back are Australia's Katherine Kirk and Anna Nordqvist, of Sweden, who both carded a 66.
Queenslander Sarah Jane Smith also fought her way into the mix at one under with her own stellar second round of three-under-par 68.
The Thai golfer has never won on the LPGA Tour. I'm really happy for her.
A revitalised Lydia Ko has a shot at putting her 2017 woes behind her and winning the final women's golf major of the year.
Ariya has missed the cut in three consecutive majors. Women's British Open victor In-Kyung Kim bogeyed the par-4 18th in her round of 69.
Sophia Schubert, the US Women's Amateur champion, made her mark playing alongside the professionals with an impressive opening 68, two better than defending champion Chun In-Gee and seven ahead of world No.1 Ryu So Yeon.
Park had been six over through just five holes in the rain and wind before play was abandoned and all scores wiped. Two holes later, play was stopped.
Hull birdied four of the first seven holes to get back to level par for the tournament, but she could not make any further progress and bogeyed 10 and 17 to end the day 11 shots behind the leader.
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"I was lucky", admitted the 23-year-old South Korean. "I just need to just accept it".
"I mean, golf is amusing; I wasn't expecting it for sure, but yeah, I kind of surprised myself even, and certainly since then, it's just, yeah, been nice".
The American, who finished the day at the Evian Resort Golf Club four shots behind Park in joint fifth, told GolfDigest.com: "It sucked because I was playing so well yesterday, and some people weren't playing so well yesterday that are playing well today, and there's nothing I can do about that". "Putted well and I am delighted with the score".
And chase she will have to do Sunday during the final round.
Should she hold onto her position and win the tournament on Sunday, Jutanugarn would join her sister Ariya as a major victor - a feat that would see them become the first sisters to achieve that accomplishment.
"I probably don't feel that bad playing on the golf course rather than watching my sister play", said Moriya Jutanugarn, who recalled feeling "nervous, excited" previous year when finishing her round to watch Ariya win at Woburn, England.
"It was good for me playing in the last group in a major at Kingsbarns".