A French girl is currently being threatened with multi-million-dollar fines by a US court docket if she continues a legal struggle to retrieve a Pissarro portray the Nazis stole from her adoptive father.

The legal tussle in excess of La Bergère Rentrant des Moutons (Shepherdess Bringing in Sheep), done by Camille Pissarro in 1886 and value an estimated €1.5m (£1.3m), is involving Léone-Noëlle Meyer, 81, a previous president of the Galeries Lafayette department keep, and Oklahoma University’s Fred Jones Jr Museum of Artwork, which was gifted the portray by a nearby household.

It is at this time hanging in Paris’s Musée d’Orsay but is owing to return to Oklahoma later on this 12 months below an arrangement to share the operate, which Meyer is contesting.

The plaintiffs are demanding Meyer be fined $3.5m in the US and deal with penalties of up to $100,000 a day for contempt of court if she does not halt proceedings in France in which she is trying to find comprehensive ownership of the impressionist perform.

Léone-Noëlle Meyer at a charity gala in Paris in 2015

Léone-Noëlle Meyer at a charity gala in Paris in 2015. Photograph: Bertrand Rindoff Petroff/Getty Pictures

Meyer, a retired paediatrician, suggests she is combating a “quest” on behalf of the family she shed in the Holocaust and her late adoptive mom and dad. “Mrs Meyer is not executing this for income. She is performing this in memory of her father who owned the painting. She does not want to cling it in her living home, she desires to give it to the Musée d’Orsay,” Ron Soffer, her attorney, told the Guardian.

The scenario hinges on no matter if an agreement Meyer signed in 2016 for the Oklahoma museum to share the painting with the Musée d’Orsay on a three-year rotation overrides a 1945 French regulation necessitating the restitution of functions looted by the Nazis to their rightful homeowners.

Meyer, outlined as the ninth-richest girl in France value an believed €600m, promises she signed it under duress. “I was named at 2am and my American attorney put me beneath powerful force to settle for this offer. I did not have the choice,” she told Le Monde.

“Faced with the prospect of dropping the portray permanently, Madame Meyer experienced no other option but to signal an arrangement granting Oklahoma fifty percent the ownership legal rights about a portray that, according to French regulation, Oklahoma experienced no legal rights to,” Soffer included.

La Bergère was obtained by Meyer’s adoptive father, Raoul, in the 1930s. In the course of the Nazi profession, he and his wife, Yvonne, fled Paris, putting their art selection, which also incorporated a Picasso, a Renoir and a Bonnard, in a financial institution vault where it was learned by the Germans.

Raoul Meyer went to court docket in Basel in 1953 in an unsuccessful try retrieve the function from a Swiss seller, and it then arrived in the US.

Soffer argues the 2016 arrangement are unable to choose precedence in excess of a 1945 French regulation developing that “no possessor can prevail from the respectable owner of a operate stolen by the Nazis”. “Under this legislation, the American museum is presumed to have been a possessor in terrible religion,” he extra.

Meyer dropped her mom, grandmother and more mature brother at Auschwitz. She was adopted as a seven-year-previous by the Meyers from a Paris orphanage.

In an open letter to the “People of Oklahoma” in 2014, she wrote: “Please fully grasp that my quest carries with it a incredible emotional load. My complete biological family members was murdered at Auschwitz between 1942 (the Vel d’Hiv pogrom) and 1944: first my mother in 1942, then the relaxation of my family members in 1944, whilst I, someway, miraculously, survived this slaughter.

“I view this quest as a two-pronged duty to try to remember: a responsibility to my organic relatives and a obligation to my adoptive household. Do not feel for a instant that any of this is simple. It forces me to dilemma my full existence.”

Soffer suggests Meyer has tried to resolve the dispute. “She made available to buy the portray again. They refused. The reality is the painting ought to have been restituted to Madame Meyer beneath French law. It belonged to her father and as his heir it must be restituted to her,” he stated.

Olivier de Baecque, a lawyer for the Oklahoma museum, disagrees. “A transaction has been signed, permitted by French and American judges and Madame Meyer should respect it,” he explained to Le Monde. “In the event of complications, it is stipulated that it must be returned to an American judge.”

The French court docket listening to has been postponed until finally 2 March, with the judges purchasing both equally functions to take part in particular mediation.

In 2018, a Paris courtroom ordered that a Pissarro portray stolen from a French Jewish spouse and children all through the German profession need to be returned. The painting’s American proprietors, Bruce and Robbi Toll, claimed they had bought the operate, La Cueillette des Pois (Pea Selecting), in good religion in 1995 and had no thought it experienced been seized from Simon Bauer, a Jewish collector, in 1943.