“Graces from God” only pass through Him, Christ, and the Holy Spirit.
But non-deities like Mary and Paul surely were capable of, at one time, showing God’s Love, Mercies, and Truth.
However, I know you Catholics think people in Heaven can do all sorts of things for you. Who’s your Patron Saint of Lotto?
At one time. Yes. When they LIVED.
All the dead in Christ are united with Christ outside of time and space in eternity, at the same instant.
People are not up in heaven "doing stuff" now. The dead SLEEP in this continuum, and are raised at the last trump along with the Raptured all in the same immortal instant.
So for the person, the soul, the conscious sentient being, death, and resurrection happen INSTANTLY. And they happen AT the last Trumpet.
All the saints, all together, from Stephen the first to the very last person to die 2 seconds before the Rapture, we all "get to heaven" THEN.
The only people IN heaven who were NOT created there, are the Old Testament Saints who died BEFORE Jesus. From Able to the Thief on the Cross. THEY are in heaven now and "doing stuff".
Jesus went to the Abrahams bosom and freed those there and took them with him into Heaven. Closed the gates of Hell and only the wicked go there now.