Becoming a saint is actually really easy - being canonized, well that is a different story.
Zita lived a pious and humble life. A house servant her whole life, despite run-ins with the family she served and fellow servants over her generosity they could find no fault in her service, eventually rewarding her with the truest of Scriptural rewards: the keys to the house.
So it did not take much for her to be a saint, except perhaps the everyday grind of servitude, which she supplemented with daily Mass and private prayer.
Part of the canonization process is the digging up of the saint's body to verify several things about the person. In Zita's case not only was everything verified but she was also intact, meaning that she was an incorruptible, a term which hearkens back to the Scriptures: "because you will not abandon my soul to the netherworld, nor will you suffer your holy one to see corruption." (Acts 2:27, 13:35; Psalm 16:10) It is a statement not just to the physical body but to the soul as well - that is what makes her a saint - the incorruptibility of her soul.
This seeming obsession with bodies, bones, relics...frankly it can be a bit off-putting for some but we do not shy away from death or the things of death. We in fact celebrate them, for death is not Death, nor the body our Heavenly Body. We are an Easter People, a people of death and resurrection, and "Alleluia!" is our song.
Zita pray for us that we may serve God everyday and in everyday ways; pray that our souls may also be incorrupt and that the white garment of our baptism may be still white when we present it to the Lord.
...a servant is not holy if she is not busy; lazy people of our position is fake holiness.