User blog comment:B214/Volume 22 spoilers/@comment-24583889-20160621010300/@comment-1359322-20160714125035

@Sky, Two reasons.
 * 1) She can give blessing.
 * 2) The author listed her as a Dragon God.

@Shattered, there's nothing to indicate that all Gods come from nothingness, Ophis is a special case since she was born from the Dimensional Gap.