It's a bit hard to make out the handwriting on this document but the first verse is almost exactly the same as the way Skara Brae sang An Chrubach

https://www.duchas.ie/en/cbes/4428366/4400163/4515855

One minor difference I noticed is line 5 "Níor B'fhada" ... instead of "Cha b'fhada". The meaning is the same whichever way you put it "it wasn't long" (her time on the island wasn't long).