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Arwen's statement to Aragorn on his deathbed that "there is now no ship that would bear me hence", when considered against the background that Legolas had yet to build his ship in Ithilien, is I think significant.
The physical ability to go West was still therefore an option for Arwen, because a ship would become available. So she either underwent some kind of physical change becoming mortal, and/or was banned from the West, and/or even swapped her "berth" on a ship with Frodo. I seem to remember she implied to Frodo that he could go West in her place.
The same kind of strictures surely didn't apply to Elladan and Elrohir and I'm pretty certain they remained of elven-kind and could go West any time they chose during the Fourth Age.
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