How does canonisation happen?

The recognition of a miracle is seen to verify that person is with God and has intercessory power with God.  Blessed Mary MacKillop does not grant the favour herself but intercedes with God on behalf of those who ask the favour.  Canonisation at present requires proof that a second miracle has occurred since beatification.  The proof of such a miracle must be rigorously studied and presented to Rome, where the Cause is reopened.  When all has been accepted by both the theologians and the medical experts the Holy Father issues the decree and the ceremony can proceed.  The title of “Saint” is now granted.

Canonisation means that the saint is recognised world-wide and venerated as a saint for the universal Church.  The feast-day is in the universal Church calendar and the liturgy and prayers be universally used.