Thanks so much folks, it is as I thought, my mum calls a different tune this name The Rope. She also said it is called Ma bhíonn tú liom whch I hear in the bothy band tune but the tune is nothing like the one she sings and I can't hear the words when she sings it. Maybe it is about something entirely other and is misremembered. It is a good tune tho. However I did hear the tune she sings called The Twisting of the rope in the Hammersmith centre Irish whistle group. The plot thickens....

Is there a place I can share the audio in case one of you knows it? She is from Enniskillen, not sure if it is local to there.