Overlooked Point -- The Books Treat Galadriel Much Like Boromir
I started to just add this merely as a comment, but really I think it's a different point altogether about Galadriel. In the book, Galadriel was definitely tempted by the Ring and influenced by the lure of its power, You can see this in some very conspicuous descriptions.
(A) First, when Frodo offers the Ring to her, she says to him (emphasis mine),
Gently are you revenged for my testing of your heart at our first
"Testing" is very close to "tempting" in the English language, though not so much in the USA. A place where you can still see this is in English translations of the Bible, where trials/testing/tempting are part of the same semantic domain. In other words, she tempted/tested Frodo about going home to the Shire (earlier in the chapter), and now he tests/tempters her.
(B) She describes a intense desire for the Ring, almost to the point of being consumed by it in her thoughts (emphasis mine).
I do not deny that that my heart has greatly desired to ask what you
offer. For many long years I had pondered what I might do, should the
Great Ring come into my hands, and behold! it was brought within my
She was certainly not immune to the lust for power that the Ring creates (on this point, see especially T. Shippey, The Road to Middle Earth
(C) She even admits she pondered taking the Ring from Frodo by force and justifying it!
The evil that was devised long ago works on in many ways, whether
Sauron himself stands or falls. Would not that have been a noble deed
to set to the credit of his Ring, if I had taken it by force or fear
from my guest?
Notice that Galadriel's reasoning here is almost exactly like that of Boromir in a subsequent chapter, "The Breaking of the Fellowship." Boromir also lusts after the Ring, the Power it would provide, and the victory it could bring. He also envisions ruling with it even after Sauron is defeated! And he feels justified in taking it from Frodo.
(D) Of course, there is her vision of Power the Ring could bring her.
And now at last it comes. You will give me the Ring freely! In place
of the Dark Lord you will set up a Queen. And I shall not be dark, but
beautiful and terrible as the Morning and the Night! Fair as the Sea
and the Sun and the Snow upon the Mountain! Dreadful as the Storm and
the Lightning! Stronger than the foundations of the earth. All shall
love me and despair!
At this point she reveals her own Ring, and "there issued a great light that illumined her alone and left all else dark." The text seems to imply (but open to interpretation) that she was contemplating the combined might of her Ring and the One Ring.
(E) Conclusion---She was tempted by the Ring's power. She was able to be corrupted by it. In fact, even though the Ring was lost out of existence, just knowing that it did exist led her to "ponder" the might she would wield if she obtained it.
Still not convinced that it tempted her?
(F) She ends the event with,
'I pass the test,' she said. 'I will diminish, and go into the West, and remain Galadriel.'
In other words, she admits it was a temptation. Everything here parallels Boromir's subsequent discussion with Frodo, with the exception that he failed to resist it like the others.