The relevant links are:

PRETTY PEG -DT file; with plenty of holes in it.

Lyrics to "Pretty Peg" by The Bothy Band? - The thread from which it was harvested; prematurely, I'd have thought.

Lyr Add: PRETTY PEG or THE KEECH IN THE CREEL -A better transcription, though still containing obvious mistakes; followed by an improved transcription from Wolfgang.

Bonnie has added some very useful corrections too; keen eye was obviously wrong, and traditional versions tend to have key lying under or key in-under. We still don't have an entirely accurate text, but Triona was a bit of a mumbler in those days, so it's hardly surprising. Gaps can easily be filled from the many traditional sets of the song, so I don't think that her exact words really matter very much, except insofar as people will sometimes want to learn an arrangement exactly as it appeared on a favourite record; which can be a bit of a trial if Triona was the singer!