You might check the midi with the DT file LIMERICK IS BEAUTIFUL, nonetheless. Colleen Bawn was an alternative title for it, though the set in the DT is Michael Scanlon's re-write of an older song, and no reference remains to the lady in question. Another form of the song appeared in Boucicault's opera The Colleen Bawn (1860), so it was pretty well-known. There are various broadside examples, published in both Ireland and England, at Bodleian Library Broadside Ballads.