“From the top of the dens, you overlook the baribal bears, bison and coyotes of the American Zone in a minimalist and unusual setting,” reads the promotional material on the website.
Rates for the dens average €420 (£355) a night in summer.
In order to gain access to the enclosure, the victim would have had to pass two security systems, a ditch and an electrical deterrent, designed to prevent the animals from getting out.
An investigation has been launched by the Mantes-la-Jolie gendarmerie research brigade.
Ms Bercheny said: “Thankfully, our zookeepers were quick to intervene and we were able to save her. We’ve launched an internal investigation with the prosecutor and we’re analysing the chain of events.”
Opened in 1968 by local chateau owner Paul de la Panouse, the Thoiry zoo and safari houses 1,500 animals, representing 180 species, including 60 endangered ones across 150 hectares.
It claims to have been the first safari to open in France.
De la Panouse recalled to regional newspaper L’Independant in April how he initially stocked the zoo with a ship loaded with 120 animals brought from Kenya.
He sold the zoo to a group of investors in 2018.