Police said the woman was inside the fenced area with her dog on a footpath, when around 20 of the animals became agitated and charged her.
Rescuers attempted to resuscitate the woman on the spot for 45 minutes, but she finally succumbed to her injuries, said the ÖAMTC Air Ambulance.
According to police, the herd probably took exception to the dog, as many cows see them as threats to their calves.
The animals are said to have previously not been known for aggressive behavior, according to a local witness.
There was a recent similar incident with a hiker, which ended without injury, police said.
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