I do not understand why her feast is an optional memorial.
Mothers can pray to her and so can singles, and nuns.
A great saint...
Lord, you chose Saint Jane Frances to serve you both in marriage and in religious life. By her prayers help us to be faithful in our vocation and always to be the light of the world. We ask this through our Lord Jesus Christ, your Son, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.