Alessandra was born in 1910 to a German father and a Swiss mother from the Lugano family Ratti. In 1944 she married Rodolfo Gucci in Venice, they had one son. Alessandra was an actor with the stage name Sandra Ravel. She died of cancer in 1954 at age of 44 years.
Research Notes
Different sources have different spellings of her name:
English, German and Italian Wikipedia: Alessandra Winkelhauser Ratti
"The House of Gucci", 2001: Alessandra Winklehaussen
Mentioned as wife of Rodolfo Gucci: Forden, Sara Gay. The House of Gucci : a Sensational Story of Murder, Madness, Glamour, and Greed. First perennial edition. New York: Harper, 2001. Family tree on p. XV.