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The pushing-into-the-water scene seemed to be the point when Daisy changed. She was so hesitant to let go of all the weight she put on herself. It was the act of being plunged that seemed to drown all that weight. She was free.
This is much like baptism through water where the Holy Spirit does the pushing and the changing in the sacrament. The Holy Spirit takes all of our sins and baggage away so we can be free.