I'm going to have to disagree with you on this one.
When faced with creatures in her regular title? Diana butchers them. She sliced off limbs in a very graphic fashion, and then there's this:
And she sorta sliced and diced her way through Hades:
I have no reason to believe that, if faced with a creature out of Tartarus, Azzarello's Diana wouldn't pull out the sword and go to town.