Patsy goes on about it in DOI, pb, pg 253 - 254. She says purple is the color of both Lent and Advent. She didn't usually decorate the tree in purple, but when she got out the Christmas decorations, she saw some purple velvet and decided to use it for the tree. This is where she starts getting a little freaky.
"In a strange and unexpected way, I had unconsciously woven death into the fabric of our Christmas celebration, and, of course, couldn't have imagined how that 1996 Christmas season would end for us. I couldn't help but feel that there had been a premonition in my selecting purple ribbon for our Christmas tree. Without an awareness of its significance, I had placed the meaning of Lent in the midst of our celebration of the nativity. Beckoning to the future, the use of the deep purple ribbon suggested that what began in the cradle would end on the cross."
Then she goes on the say that purple is particularly significant to Christians because it blends red and blue, and "Anglicans often think of blue as the color that symbolizes mankind or humanity. Of course, red represents our redemption through the shed blood of Christ. As the red and blue come together in purple, it becomes a symbolic way of telling the world that 'God is present' with mankind. As those ideas worked in my mind, another connection began to form. An assurance had been handed to our family with the presence of the color purple. As God was present in the crucifixion of Jesus, in ways that we couldn't grasp or understand, he was also present in the tragic death of our daughter. In the extreme pain of our loss, God the Father was standing near with his hand upon the Ramsey family, as interwoven in our lives as the ribbon on the tree.
Purple did have a place after all..."
So, as you can plainly see, JonBenet had to die because Patsy used purple on the tree. Her death was a sacrifice to mankind attended by God himself, as he blessed the family that oh so selflessly gave her up so that people could become closer to the Lord.
Preordained according to the Gospel of Patsy.