She inherited millions when her grandmother, Traudl Engelhorn-Vechiatto, died in September 2022.
Traudl Engelhorn-Vechiatto’s wealth was estimated by US magazine Forbes at $4.2bn (£3.3bn; €3.8bn).
Even before her grandmother died, Ms Engelhorn had declared that she wanted to hand out much of her inheritance.
The sum she retains is undisclosed, but back in 2021, Ms Engelhorn said she wanted to hand out at least 90% of her wealth because she had done nothing to earn it and had merely struck lucky in a “birth lottery”.
In the past, Ms Engelhorn has called for inheritance tax to be reinstated in Austria.
Austria abolished inheritance tax in 2008, one of a handful of European countries that do not impose inheritance tax – or death duties.