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I have the answer! From In the House of Tom Bombadil , third paragraph:
They came a few timid steps further into the room, and began to bow low, feeling strangely surprised and awkward, like folk that, knocking at a cottage door to beg for a drink of water, have been answered by a fair young ELF-QUEEN clad in living flowers.
Now this doesnt exactly mean that she is an elf queen, cuz it says "Like folk that". But i think that this is a good quote to help us solve this problem...But then after that she says:
And River was capatalized in the book, but that probly doesnt mean anything... But this could mean that she is a Maiar, maybey offspring of Ulmo er somthin like that... er the same type of Ainur... Iduno, just found 2 good quotes that might be helpful
I abhor peoples' seemingly insatiable need to label Tom and Goldberry, convinced that they must be specific creations in the mythology at all.
However, the most convincing argument I have seen to date as to what Tom is, if he must be something, is Gene Hargrove's assertion that Tom is in fact Aulë.
I am comfortable with the idea that Goldberry, "daughter of the River," could indeed be a Maia.
The only convincing argument that I have seen as to what Tom is comes from JRR Tolkien himself.
Tom is an Enigma.
All else is speculation and of equal merit.
As to the Quotes about Goldberry, they only show how Tolkien did everything he could to make sure that there was no certain answer to this question. (which gives us something to debate when we can't think of other questions. )