She was born on December 22, 1856, in Paris, France, to Antoine-Hippolyte Cros and Leonilda Mendès e Texeira.

[3] On August 28, 1873, the Criminal Court of Paris ruled that Antoine de Tounens, first "king of Araucania and Patagonia" did not justify his status of the sovereign.

[4] Since the death of Antoine de Tounens, some French citizens without familial relations declared themselves to be pretenders to the throne of Araucania and Patagonia.

[5] The pretenders to the throne of Araucania and Patagonia are called monarchs and sovereigns of fantasy,[6][7][8][9][10] "having only fanciful claims to a kingdom without legal existence and having no international recognition".

[11] On November 1, 1903, she succeeded to his father Antoine-Hippolyte Cros as pretender to the throne of Araucania and Patagonia.