On the one hand, Galadriel could perhaps have used her ring in a 'defensive' manner. The star-glass certainly repelled evil beings such as Shelob, wouldn't her elven ring, being far more powerful, have a proportionately greater effect on Sauron's servants? Perhaps it would have protected the elvish forces invading Dol Guldur (if that really happened!!) by negating the morale-lowering effects of the Nazgul etc.
On the other hand, Gandalf possesses an elven ring too but it seems to have no effect on the goblins in the hobbit, the wolves in Eregion or the orcs in Moria. Perhaps he was wary of deploying its full power (being under orders from the Valar to avoid open displays of power after all).
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Rumil of Coedhirion
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