No "Scottish dialect origins" for this one, which clearly derives from the independent English broadside sets (Holger Nygard, for one, considered the song to have come to England from France, and later to Scotland. My own feeling -unsupported by concrete evidence- is that the Scottish Lady Isabel forms are a separate but pretty much contemporary import).

Neither are the texts quoted from Child (URL above) "originals" (so far as can be told); just earlier forms. See the many other threads on this song-family for more information.

Take Mary's advice and ask for help, not from us, but from those nearer to the horse's mouth.