I have the results of her grandson and of her great-grandaughter.
Grandson:
https://i.postimg.cc/rwzhRHQT/marco-results.jpg
He's almost fully European as well. He is the son of her son, his mother was an Italian immigrant.
His daughter:
https://i.postimg.cc/gcNqyDw2/bisneta-results.jpg
She has more admixture, but not by a lot. Her mother is from Bahia that's why the girl has a bit more admixture, but the
mother is a white baiana - 85% Portuguese, 7% Amerindian and 7% SSA (and she looks very white, tall and with blue eyes).
A big portion of the white upper middle class in Brazil is highly endogamous from a phenotypical point of view. That's why even if some have small admixture most individuals tested consistently score above 85% European.