I like Jim Lad's version above. Elsewhere, Jim mentions that the current lyrics are from the following book of "Irish Country Songs" published in 1909. Here's the full citation:

Irish country songs / collected and arranged by Herbert Hughes.-- Pub info London ; New York : Boosey & Hawkes, 1909-1915

However, I've also read that Padraic Colum derived the lyrics from an older County Donegal ballad that was published in the 1909 edition of that work. Does anyone have a copy of that 1909 edition? I'd like to know the lyrics of that ballad from which "She Moved through the Fair" was derived, if it was printed in that book. Thanks!