I believe that it is impossible for Galadriel to have equalled Luthien, even if she had "Feanorian" powers and Nenya. My reason?
Elrond.
Elrond is clearly shown in the
Lord of the Rings to be Galadriel's peer. They have their "specialties", sure enough, but overall they are comparable. In some ways, Elrond is clearly the superior.
While it is true that Elrond bears Vilya, said to be the greatest of the Three Rings, I highly doubt that the difference in Ring-Power would make him Galadriel's equal, if she is of "Feanorian" power.
The reason lies in his descent from Luthien. Tolkien refers to the lineage of Luthien in Elros' descendents as being the key to their "divine"-like status- not their royalty or Elven blood. In addition, note this quote from "The Houses of Healing":
Quote:
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Aragorn went first to Faramir, and then to the Lady Eowyn, and last to Merry. When he had looked on the faces of the sick, and seen their hurts he sighed. 'Here I must put forth all such power and skill as is given to me,' he said. 'Would that Elrond were here, for he is the eldest of all our race, and has the greatest power.'
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Elrond's power is clearly tied to being much older than Aragorn, and the power is obviously from their joint lineage, a lineage in which Luthien figures most prominently, and to which Tolkien refers most often. Tolkien refers to Luthien more than any other First Age ancestor in connection to Aragorn than any other in his Letters- including Earendil.
Now, if Luthien's great-grandson is such a powerful figure based on her blood, and if her blood is still shaping the lives of her descendents as far down as Aragorn, then I would say that it's quite unlikely Galadriel was her equal, Nenya or no Nenya.