In the version my Gran sang (she was partly raised by an Irish family) it was the father that found the daughter...slightly different verses than the one above...

Her mother then left her alone
In sadness there to weep and moan
And when her Daddy he came home
He said, "Now where has my daughter gone?"

He rushed upstairs, knocked down the door
And found her hanging to the floor
He took his knife and cut her down
And in her pocket this note he found.

My Gran always sang this with a dramatic quaver in her voice, quite unlike the voice she used to sing Ta Ra Ra Boomp De Ay!