"I'm so proud of the girls, because it was such a hard game.
"We scored really early and then today we held it out."
Performing on the platform of aggression, the 28-year-old said, sticking to the game plan of trying to eke out more goals.
Kenny said their World No2 side didn't have the best three games leading to the quarterfinal but the beauty of playoffs was the ability to put the rot behind to make a fresh start.
"You have a chance to start clean and knuckle down when you hit that quarter-final," the 128-game veteran said, adding "nothing can stop us" before tomorrow's semifinals.
Argentina player Pilar Romang said they had the lion's share of penalty corners and possession, but accuracy deserted them.
"We're disappointed we didn't score and they didn't gain [much territory]," Romang said.
The 22-year-old midfielder lauded Australia's stoic defence.