Ms Koppa's face turned blue and she was clinically dead for several minutes after the collapse, according to 7NEWS. A couple on their morning stroll stopped and called triple-0.
"Her face is blue. I didn't know she was that bad. She's just saying she's not breathing," a good Samaritan said during the emergency call.
Before paramedics arrived, strangers performed CPR and delivered a life-saving shock using a defibrillator rushed over by staff from the Star casino.
"I pressed the button, had everyone stand back. We shocked her once," one of the rescuers said.
Despite being fit and healthy, Ms Koppa had been unaware she carried a genetic heart condition. The reunion brings together the runner with the bystanders whose quick actions, including the use of the casino's defibrillator, kept her alive until professional medical help arrived.