The A standard for the 1500m is 4min 18.50sec and the B standard 4min 22.50sec.
In a special time trial at the Caledonian Ground on Saturday, Angie Smit (Canterbury) won the 1500m in 4min 19.33sec, with Greene second in 4min 20.32sec.
Greene (19), a food science student at the University of Otago, was told by officials that she needed to beat the B standard again to confirm a spot in the New Zealand team for the Games in Russia.
The runners decided to have another official time trial on Sunday to clinch a place in the team. Smit won in 4min 18.52sec, and Greene was timed at 4min 18.95sec.
Greene was marginally short of her Otago senior women's record of 4min 18.90sec she ran at the world junior championships in 2010. It was a faster time on the second day.
''We started off slower on Sunday and that helped a lot in the end,'' Greene said.
''We went through a bit fast on Saturday and we ran more tactically on Sunday.''
Greene suffered from a stress fracture of her left tibia and missed most of the New Zealand track season. She had just one competitive run over 800m at the Caledonian Ground before the New Zealand championships.
Greene has only had five 1500m races on the track since the beginning of October. Her first was at the New Zealand championships in Auckland when she finished fourth.
This was followed a few weeks later by a heat and final at the Australian championships in Sydney when she finished 11th in the final.
She plans to have a 1000m time trial in Timaru in two weeks and she will leave New Zealand for the World University Games in mid-June.
The time on Sunday would probably be good enough to get Greene to the final in Kazan. But to reach the podium she would need to run considerably faster. A time under 4min 10sec was needed to reach the podium at the last World University Games in 2011.
Greene was grateful to the Athletics Otago time keepers who came out again on Sunday at short notice to make her time official.
World University Games
The facts
Venue: Kazan, Russia.
Date: July 6-13.
Otago athletics qualifiers: Rebekah Greene (1500m), Andrew Whyte (400m), Daniel O'Shea (400m hurdles).
