fullness of grace
Abundance or superabundance of sanctifying grace or interior holiness, predicated by Sacred Scripture of Our Lord, of Saint Stephen, of the Apostles, and of Our Blessed Lady.
As applied to Mary, the Mother of God, it is a fullness intermediate between that peculiar to Christ, and that of all the angels and saints.
Granting Christ's obvious and necessary superiority, we may assume with Suarez that Mary's sanctifying grace transcends by far the combined sanctity of all other creatures.
New Catholic Dictionary