Netherlands' King Willem-Alexander, Queen Maxima
Netherlands' King Willem-Alexander (L) officially opens the new parliamentary year with a speech outlining the government's plan and budget policies for the year ahead, next to his wife Queen Maxima, in the 13th century "Hall of Knights" in The Hague, Netherlands September 15, 2015. Reuters/Lex van Lieshout/Pool

The younger sister of Queen Maxima of the Netherlands was found dead at her apartment in Buenos Aires on Wednesday night. Inés Zorreguieta, 33, is believed to have taken her own life.

A spokesman for the Dutch government told Argentinian newspaper La Nacion that her death was presumed to be a suicide. Inés worked for the Ministry of Social Development in her native Argentina.

Inés was a bridesmaid at her sister’s wedding to then-Prince Willem-Alexander, who is now the king, in 2002. She was also a godmother to the royal couple’s youngest daughter, 11-year-old Princess Ariane.

Dutch Crown Prince Willem-Alexander in uniform stands with his bride Argentine Maxima Zorreguieta (C) as they pose with members of the royal family and close family before their marriage in Amsterdam, February 2, 2002. Some 1,750 guests attend the wedding of the eldest son of the Netherlands Queen Beatrix (5th R) and Prince Claus (4th R) in the capital's 600-year-old Nieuwe Kerk church. First row, 3rdL-3rdR: Juan Zorreguieta, Marcella Cerruti, Mariana Andres Zorreguieta, Martin Zorreguieta, Maxima Zorreguieta, Prince Willem-Alexander, Queen Beatrix, Prince Claus, Prince Bernhard. Back row, L-R: Senior Vojnov, Senora Angeles Zorreguieta de Vojnov, Mrs. Lewis Zorreguieta, Mr Lewis, Maria Zorreguieta, Dutch Prince Constantijn, Princess Laurentien, Prince Friso. Reuters/Paul Vreeker/Pool

According to reports, Inés had been suffering from depression. No other details on her death have been made available at this time.

Queen Maxima was “shocked and devastated” by her sister’s death, the Dutch government told the paper De Volkskrant. She has already cancelled all of her schedule and is believed to be travelling from Holland to Buenos Aires soon. King Willem-Alexander will carry out his duties alone.

Inés was the youngest child of Jorge Zorreguieta, who was agriculture minister during Argentina’s brutal military dictatorship, and his second wife, Maria del Carmen Cerruti Carricart. She and Maxima have two brothers, Juan and Martin, and three half-sisters, Dolores, Maria and Angeles Zorreguieta Lopez. Their father died last year from non-Hodgkin’s lymphoma.

Their brother, Martin, posted a video of her Inés singing and playing the guitar last year. He called her “very beautiful and talented.”