I dont think Arwen was a sheildmaiden or anything, and I'm not saying she was as powerful as Luthien, but one of the most powerful of the Noldor was her grandmother! Surely a good bit of that power would appear in Arwen. She inherited Luthien's likeness, and probably her ability to use that beauty and her own elven power to enchant people.
Now maybe she couldnt DEFEAt all the ringwraiths at once under their fell captain, but i think she could stall them or distract them or entrance them or something.
Of course with all the ringwraiths together even distracting them would be a heavy task, but maybe if it were just one of them it would be easier... Just a thought.
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There long the golden leaves have grown, upon the branching years, while here beyond the sundering seas, now fall the Elven-tears...
but if of ships I now would sing, what ship would come to me, what ship would bear me ever back, across so wide a sea?
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