Good point. Though since Diana wins the Contest and both Hippolyta and Philippus consider her the winner being a foregone conclusion, maybe she still is superior to the other Amazons in part due to her heritage. The Gods just gave her a boost, or maybe even unlocked latent powers that were already there?
Anyway, I'm guessing it's going to break down like this:
Demeter- Strength of the Earth/ Super strength
Hermes- Enhanced speed/flight
Artemis- Communion with animals
Hephaestus- Sisterhood with fire
That leaves Athena, Aphrodite and Hera. The former two's classic gifts would be kind of weird to bestow upon Diana now that she's already an adult with a loving heart and potential to become wiser, and Hera never really bestowed any gifts in any versions that I'm aware of.
Another neat thing I noticed: Barbara had a statue of an owl on her desk. Minerva = Athena by another name, so that symbolism is obviously important in some way. It was always one of the best indications that Barbara was meant to be Diana's dark mirror above all others.