Strack (21) put her foot on the Olympic step by convincingly defending the premier lightweight singles title on Friday.
Trials are being held at Lake Karapiro next week and the team for the world championships will be named after that.
She consolidated her position on Saturday by winning a silver medal in the heavyweight singles sculls behind world championship bronze medallist Emma Twigg (Auckland).
Twigg led from the start and won the title in a time of 7min 49.01sec from Strack 8min 00.21sec and Fiona Bourke (Otago University) 8min 02.52sec.
The silver medal against the heavyweight scullers highlighted Strack's potential.
"It was nice to race against the big girls, to see how I compared with them," Strack told the Otago Daily Times after the race.
"I went into today's race with the view that everything was possible. I just wanted to see how far I could push myself."
Strack had a slow start and was in fifth place at the 1000m.
But she was not worried.
"It was all about patience," Strack said.
"I knew I had to get back in touch with the rest of the field but I wanted to do it my way."
Strack did not want to deviate from the race plan she had worked out with her coach, Gary Hay.
She closed the gap and was level pegging with Bourke and Emma Feathery (Auckland) with 250m left.
"I went into a mad sprint and it paid off," she said.
A year ago, Strack was a rower of promise but she never dreamed of representing New Zealand at the London Olympics.
However, that is now a real possibility, after an outstanding 12 months when she won a silver medal in the world under-23 championships at Belarus and finished sixth at the world open championships at Lake Karapiro.
Otago University rowers Fiona Bourke and Sarah Lindley were members of the Southern RPC crew that won the gold medal in the women's eight when they beat the Central RPC crew skipped by world champion Rebecca Scown.
The Otago University men's club eight of Jamie Saunders, Thomas Stott, Matt Smaill, William Hyndman, Peter McDowall, Trent Morris, Adam Garden, Matt McGovern and cox Aynsley Moore won their event in 6min 13.93sec.
Another Otago winner was Justin Evans (University), who teamed with Finn Scott (Canterbury) to win the lightweight men's double sculls in 6min 52.30sec.
Fergus Fauvel (University) was a member of the Southern RPC coxless quadruple sculls that finished second to Central in a time of 6min 3.31sec.
Otago clubs had three members of the Southern RPC crew that finished second behind Waikato in the men's under-21 eight in 6min 09.13sec.
They were Robbie Mears (North End), and James Harvey and Michael Dessoulavy, from Otago University.
The combined Otago University and Wanaka men's novice eight of Jamie Bowley, Elliott Meldrum, Jarrod Wellman, James Redai, Edward Styles, Adam Harris, Greg Crooks, Wills Lynton and cox Moore won a silver medal behind Avon in a time of 6min 48.89sec.
The Wakatipu combination of Olivia Robbins and Kate Gilbert won the silver medal in the women's novice double sculls in 8min 2.58sec.
The Oamaru women's under-21 eight of Georgia Tangney, Katherine Hope, Jade Winter, Caitlan Kearney, Lucy Fauth, Bethany Robertson, Johannah Kearney, Eilee Robinson and cox Sophie Moynihan was second in 7min 8.73sec.
The University men's novice coxed four of Edward Styles, Adam Harris, Greg Crooks, Wills Lynton and cox Moore was second in 7min 12.79sec.
Bronze medals were won by. - North End women's under-19 double sculls of Anna McAslan and Grace Scown (7min 53.72sec); Saasha Bruce (Wanaka) in women's club single sculls (8min 23.08sec); Southern RPC (Justin Evans, University and Alistair Bond, North End, in men's lightweight pairs (7min 12.74sec).
World double sculls champion Nathan Cohen (Southern RPC) denied four-time world champion Mahe Drysdale (Auckland) a record-equalling seventh national title with a decisive win in the premier single sculls.
