I dont userstand.

[Voralphion]

The quote is here,

Letter 246:

Of the others only Gandalf might be expected to master him - being an emissary of the Powers and a creature of the same order, an immortal spirit taking a visible physical form. In the 'Mirror of Galadriel', 1381, it appears that Galadriel conceived of herself as capable of wielding the Ring and supplanting the Dark Lord. If so, so also were the other guardians of the Three, especially Elrond. But this is another matter.

I had to find it on an old thread. To me, the fact it says especially Elrond seems to say that he was more powerful than Galadriel in the way that if she could do it, then he certainly could.