She's a goddess. In the form of a human girl. Supposedly it's the same thing, there's no difference between the girl and the goddess, but personally I find it hard to see much of the goddess in her actions. Instead I see a spoiled and selfish brat who tries to play a hard game without knowing what she has to do.

[Harsh words, but Ikki was never a fan of Saori anyway.]

The gods of my world like to take human vessels to use for their own means. The only one who does it in a way that's more acceptable is Athena who takes one the moment the child is born rather than posses people when she sees fit.