Don't know the D&D rules for her [anything that makes Hades have Evil Alignment simply for being the god of the Dead and to keep continuity with the Disney Hercules movie I have a big problem with] But I do have reasonable suggestions.
Favored Weapon: Spear or Longspear
Domains: Knowledge, War, Good, and Protection
Alignment: LG
Athena/Minerva is the goddess of Wisdom, Justice, and also Strategy. While her brother Ares is god of War, she is actually a better fighter, because she can employ long-term tactics. While she is good, and generally lawful, she is not above engaging in some of the mean tricks of the Olympian Pantheon-- if it is to punish someone who did wrong. For example, she turned Arachnae into a spider for claiming to be better than the gods (at weaving). She also appears to mortals to give them quests to achieve justice, giving them aid to destroy such creatures as Medusa.
Well, hope this is of use (even if it is not the same as Dieties and Demigods). I often find myself disagreeing with how they wrote things up in that book-- Hades being my biggest pet peeve.