Why is Mary referred to as "The Undoer of Knots"

There is a special novena to "Mary: The Undoer of Knots" but how did our Blessed Mother come to have that title? In the most recent issue of Marian Helper, Fr. Joe Roesch explains:

The concept of Mary as the undoer of knots dates all the way back to the second century. In his work Against Heresies, St. Irenaeus of Lyons wrote, "And thus also it was that the knot of Eve's disobedience was loosed by the obedience of Mary. For what the virgin Eve had bound fast through unbelief, this did the Virgin Mary set free through faith." Pope Francis quoted this on October 13, 2013, during his prayer for the Marian Day on the occasion of the Year of Faith. 

He explained how our sins create knots, which take away our peace and serenity. He then said, "Mary, whose 'yes' opened the door for God to undo the knot of teh ancient disobedience, is the Mother who patiently and lovingly brings us to God, so that He can untangle the knots of our soul by His fatherly mercy." Let's turn to Our Lady for help with untangling the knots in our lives.