Q. 1. What does it mean that the Rosary is a private Prayer? Does that mean that we cannot say the Rosary as a group in the Church anymore?
A. 1. As you indicated, the Rosary is classified as a "private prayer." This means that Catholics can pray this prayer alone if they decide to do so.
While the Rosary is a "private prayer," the Catholic Church has never forbidden the faithful from praying the Rosary or other acts of devotion in the Church outside of Mass. For those who wish to recite the Rosary in the Church before or after Mass as a family or a group, the Church grants a plenary indulgence.
Prior to Vatican II, many of the faithful were reciting the Rosary during Holy Mass instead of participating in the liturgy that they were attending. The Catholic Church condemns the reciting of the Rosary during the Holy Mass. There is a time and a place for everything. Private devotions do not belong during the Holy Mass.