Why is Netflix's Blood of Zeus letting Athena fade away into nothingness despite her being an important god in Greco-Roman ...

Athena was a huge help in Hades, but doesn't show up to offer her Boons in the sequel. There's a story reason given, though, as Hephaestus explains that she's testing weapons and armour.

she plays an important role in Greek heroic tradition and features heavily in the 7th-century epics the Iliad and the Odyssey. Athena was also one of three virgin goddesses, the other two being ...