DENVER — On the day she is to become a woman, Monica Reyes sits in front of the church for Mass. Her white dress — sewn in her mother’s Mexican hometown — spills over her chair like an oversized lampshade.The priest urges her to live as a daughter of God. Her parents give her a gold ring shaped like the number 15. Near the end of the service, Reyes lays a bouquet of roses before a statue of the Virgin Mary. Monica Reyes has her picture taken at the alter after her Quinceanera Mass in Denver Saturday, Sept. 8, 2007....