Think about it, Circe is famous of her changing people into animals, and she is the daughter of Helios, Titan Sun God (son of Titan Hyperion and Theia) and Perse an Oceanid (daughter of the Titans Oceanus and Thethys). They have enough resources to "amp"her power enough I think by allowing her access to the Golden Fleece (after all, Circe and her are cousins, I believe).
The two of them will together will be a great challenge to WW; Cheetah on a physical martial level, and Circe on a magical level (if Diana indeed has god-like powers, we'll see).
I think Circe giving her power is far better than the Marijuana plant god.
lol
TT