What connection between Goldberry and Ulmo?

[Legate of Amon Lanc]

Originally Posted by Morthoron

Not wishing to demean Lady Goldberry nor lessen her status, but if you are speaking in context of her creation, then you must look elsewhere than Lord of the Rings -- to a 1934 poem regarding Bombadil; thus she is part and parcel of the Bombadil story, an adjunct character that was not contrived organically by Tolkien for LotR. Therefore, I would include her in the Tom Bombadil Enigmatic & Utterly Unorthodox Journey.

Originally Posted by Ibrîniðilpathânezel

I tend to think that what Goldberry is (meaning, what she is in relation to her presentation in the published version of LotR) is much the same as Tom Bombadil, an enigmatic creation that seems rather a "holdover" from the time that Tolkien was still thinking of LotR as a "Hobbit sequel." Their general nature feels more akin to the world we see in TH than it does to the world we see in LotR.

There are several views in which we can look at the topic. We can look at what Goldberry was supposed to represent in Tolkien's universe, even at different stages (as Ibri mentioned), whether she is anachronic in LotR or not, whether she is even consistent with the world etc.
What I am asking, is what would we say from the "in-world" point of view, i.e. if you were omniscient inhabitant of M-E who makes classifications of all people and creatures of Arda, what would you say about Goldberry? You cannot say "she was part of Bombadil's story" - she was not, she was a "River-daughter" (and we are to answer what that is) and Tom found her sometime during the Third Age! And now, we have to say: "She is a Maia", "she is another spirit sent by Ulmo" or "she is a being who somehow came from outside the Eä, and is not an Ainu or anything else".