Nordqvist made a 20-foot birdie putt on the 15th hole after the horn stopped play because of darkness. The players were allowed to finish the hole, and the rookie from Sweden took advantage by moving to 10-under par.
Wright ' one of eight players who failed to finish ' also played 15 holes.
Jin Young Pak completed her 69 after the horn to come in at 7 under.
Hours earlier, rain stopped play for 2 hours, 19 minutes with 22 players left on the course. Nordqvist finished nine holes at 10 under, and Wright completed 10 holes and 9 under.
Wright returned to birdie No. 11, and the Australian gained the lead when Nordqvist bogeyed the same hole. But a bogey on 13 dropped Wright into a tie atop the leaderboard.
Down by two shots at the start of the round, Wright parred the first five holes before sinking three straight birdies to go 9 under. A bogey on No. 9 stalled her momentum only momentarily, because she began the back nine with successive birdies.
The round began with Nordqvist holding a one-shot lead over Nicole Castrale.
Playing in the final twosome for the first time in her brief professional career, Nordqvist showed absolutely no outward nervousness. After both players parred the first hole, Nordqvist increased her lead to two strokes when Castrale three-putted from 25 feet.
A birdie on No. 3 dropped Nordqvist to 9 under. Nordqvist then nailed a 12-foot birdie putt on 4 and pumped her fist slightly ' a rare departure from her businesslike approach.
That lengthened her lead over Castrale to four strokes, and when Castrale missed a 3-footer on No. 5, the gap increased to five shots.
Castrale rebounded with a birdie on No. 8 shortly before the rain came, but by then Wright, Choi and Kristy McPherson had passed her on the leaderboard.
McPherson was at 6 under through 17 holes, tied with Jiyal Shin, who shot a 69.
Castrale was at 5 under through 15 holes when play was halted.
Other notable scores: Michelle Wie (73-217); Juli Inkster (73-217); two-time LPGA Championship winner Se Ri Pak (74-220); and Lorena Ochoa (73-214).