The 26-year-old former miss austria had been in a critical condition after plunging off the side of the Bergisel mountain near the city of Innsbruck on Friday.
Two students discovered the severely injured woman near the Drachenfelsen (Dragon rock) panorama platform overlooking the steep ravine of the Sill river.
Shortly after hitting the ground, Kadic managed to call her brother and inform him of the accident before losing consciousness, police said.
She was rescued by helicopter and taken to a hospital in Innsbruck, where she succumbed to her injuries on Tuesday morning.
The exact circumstances surrounding the accident remain unclear, but police said the 2013 beauty competition winner was an avid runner who knew the area well.
Some 115 people died and 2,385 were injured between May and September in the Austrian alps, according to latest statistics.