Cayden Cailean gifts Iomedae a fragment of vision passed on from Nethys, of Peranza robed in white in Erecura’s gardens, and in other worlds, that is almost enough for Iomedae to ravel the whole plot, but not quite.
In this world, for whatever reason—perhaps some subtle intervention of the God of Knowledge, perhaps just luck in which causal-paths She randomly-sampled for exploration in detail—something close enough to the truth is already in the hypothesis space of the fragments into which She dispersed after coalescing, and that vision of Peranza is enough to promote it to near-certainty.
She’s pretty sure that She’s smarter* than Cayden Cailean and can in fact do better than what he’s probably planning.
(*Less subject to poorly-chosen** resource constraints.)
(**Not in fact chosen at all, by mortal Cayden who drunkenly blundered his way into becoming a god, but operative nonetheless.)