Gal Gidot is not a large breasted woman, though I'm sure she'd be happy with the compliment.
And she's an Israeli Jew, not exactly 'white'. She's more mediterranean with middle eastern influence ('white' usually means northern european)
That being said, I think she's a solid cast for the part. Diana Prince was supposed to be Amazonian in the Greek mythos. This would put her origin somewhere in the mediterranean after Zues dropped her and her people onto this plane.