It's tricky, just like with the Greeks and Southern Italians. Ancient crossbreeding occurred.
With Greeks it's different:
https://en.wikipedia.org/wiki/Population_exchange_between_Greece_and_Turkey
This is why some people go "OMG I didn't know Greeks had dark skin" or "OMG I didn't know Turks looked so White".
Of course jews made them do it.
To answer your first question, trust your instincts and make sure to meet her family and assess their looks.
I got a look at her younger brother in a photo and that was reassuring - White as hell and had blonde child with a blonde woman
Parents, uncles, aunts. Make sure to meet them all.
Also asses the values the family upholds. Being too focused on church and worship is not always a sign of good morals, and I've noticed this is a common thing among Catholics.