While looking for information on what happened to the last of the Nasrid, I ran into a very colourful though probably fake story of an alleged descendent of Aisha (Aixa) bint Muhammad ibn al-Ahmar (called in the story Sor Isabel de Granada).

The descendent in question is Miguel Fernandez Caballero de Granada, alleged son of Ferdinand II of Aragon (the Catholic) and the daughter of Muhammad XII of Granada (the last moorish king of Spain), which according to the story I read, Fernandez would later work on the court of Francis I of Spain, meeting Leonardo Da Vinci and later moving to Milan under none other than Machiavelli (with the story alleging that Machiavelli's Prince was partially inspired by insights of Ferdinand II taken via Fernandez).

I could not find any direct references to historical chronicler or scientific articles, which makes me believe that the story is just a mene story, perhaps invented by a family to create a colourful genealogy mythos.

Regardless of the origin of the fake story, I would like to know if we have any evidence of the actual faith of the descendents of Muhammad XII of Granada?

I leave the sources to the urban legend i found below:
https://cosasdecordoba.com/sor-isabel-de-granada/
https://revistas.juridicas.unam.mx/index.php/hechos-y-derechos/article/view/12586/14144