Can’t find documentation on grandma

I can’t find my Italian grandmother anywhere online. She was an active part of my life and lived to be an old age. Recently died in 2018.

I can’t find her existence online ANYWHERE. I’ve found her siblings, kids, and even parents and grandparents but can’t find documentation or her name in a family tree.

My dad has given me as much info as he can.

We think she was born in 1921 or 1922, not even she knew the exact date.

Advice?