High Elves and the Balrogs

[obloquy]

I don't think anyone said she could "crush" a Balrog.

Is it possible to say that Galadriel could equal the Maiar's efforts in power?

Yes, in fact. We have a handy example in Glorfindel, whose duel with a Balrog went much the same as Gandalf's did. His power was actually increased through his reincarnation and recuperation in Aman, and he returned to Middle-earth almost a peer of the Maiar. Galadriel was more powerful than Glorfindel.

Relevant text from HoMe XII Late Writings:

[Glorfindel] then became again a living incarnate person, but was permitted to dwell in the Blessed Realm; for he had regained the primitive innocence and grace of the Eldar. For long years he remained in Valinor, in reunion with the Eldar who had not rebelled, and in the companionship of the Maiar. To these he had now become almost an equal, for though he was an incarnate (to whom a bodily form not made or chosen by himself was necessary) his spiritual power had been greatly enhanced by his self-sacrifice.

What, Tolkien? "Spiritual power"? Why, we have never heard of this before!