Actually I thought that when elves came back into the living after dieing, couldn't they like come back in their kids or something? Just what I heard not to sure
I think the main reason why the Silmarillion did not go into much detail on the subject of Elven reincarnation was because JRR appeared a little undecided on just how it should happen. In Morgoth's Ring he does mention that Elves could return from the Halls of Mandos into new born children, but this then presented him with a dilemna that the new born child would have the mind and spirit of another elf, and in effect rob the proud parents of creating a new entity of their own. He toyed with the idea also of creating a union between such a reincarnated elf and new born spirit which would eventually meld into one. To me it seemed that the harder he tried to solve this dilemna, the deeper he dug himself into trouble. I think in the end he chose to just leave it to the imagination of the reader, hence only brief clues as to the fate of dead elves in the Silmarillion.