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To whom does Mary pray?

In whom does Mary put all her hope an trust?

To whom does Mary pour out her heart?

That’s not the question. Why do catholics place all their trust and hope in Mary?

You asked (rhetorically we presume), “To whom does Mary pray?”
If Mary died, she is absent from the body, so we presume her spirit is present with the Lord, In Heaven. She has no need to pray since she is in the Presence of The Lord. She is more likely worshipping Him there. But your question was rhetorical since as a catholic you believe she was assumed from the Earth without dying.

Then you asked (doubtless making axiomatic the assumption you hold to be the truth), "In whom does Mary put all her hope an trust?"
Since Mary's spirit is in God's Presence, we would not entertain that Mary's spirit would blaspheme by putting trust in anyone but Her God in Whose Presence she is now, in spirit.

Finally, you asserted, in question form, "To whom does Mary pour out her heart?"
Since Mary's spirit is the Presence of The Lord, your stumbling conclusion, though posed in question form, is a flawed end to a fractured syllogism.

Underlying all of your rhetorical questions is the catholic presumption (based upon what you have had drummed into your mind) that Mary is alive in bodily form, in Heaven, and is accessible by your worship of her, or should I say adoration (worship by any other name)?

These presuptions are nowhere to be found in The Word of God. They are fabrications by the papacy and magicsteeringthem of catholiciism:
in 310AD the catholic hierarchy instituted formal prayer for the dead;
in 325AD the same Heirarchy of your org instituted the 'adoration' of saints;
in 432AD formal declaration of Mariology, or worship of Mary was made dogma;
in 606AD the claim of papal supremacy was formalized;
in 650AD a feast was instituted to honor Mary;
in 1076 the dogma of papal infallibility was declared;
in 1090 prayer beads were adopted as a means to insure repetitive uttering of prayers dictated by 'the church';
in 1220AD adoration of the wafer for Mass was instituted;
in 1439AD the doctrine of Purgatory was decreed foundational to catholiciism, a decree that made way for prayers to Mary in order to shorten or avoid purgatorial purging;
in 1854AD the Doctrine of Immaculate Conception was formalized;
in 1950AD the Assumption of Mary was formalized as Church doctrine.

The process of making way to put Mary into goddess status took centuries, but here it is, now the focus of sincere humans being duped into 'another religion', not the ekklesia of Jesus The Christ.

To whom does Mary pray?

Nobody.

She is standing right next to Jesus; relaying prayers she RECEIVES at a super human speed.

Catholic teaching.