Two recordings, as I've already said: 1967 and 1969. The first was made by Tom Munnelly, the second (longer) by Munnelly, D K Wilgus and his wife Eleanor Long-Wilgus. John Reilly died shortly after.

I doubt if there is any conscious symbolism in Reilly's refrain. Bear in mind, too, that any assumptions regarding the 'back story' must necessarily be subjective and speculative; bringing modern sensibilities to bear on an old story may be more likely to mislead than to enlighten. On the general roots of the 'Maid and the Palmer', I repeat my suggestion that you read Child's notes.

Re the Glenbuchat text, 'all her cups were flown to Rome' clearly means 'all her cups were gone/disappeared'; why is another matter. 'Nerd's suggestion is as good as any, though there may just possibly be an allusion to the widespread folk belief that all church bells flew to Rome at Easter and were absent from their places at that time. That (Catholic) belief persists in France, Germany, Austria, Czechoslovakia and so on; whether it was ever common enough in Scotland to be a meaningful image there I wouldn't know.