Scripture indicates that God the Father predestined our salvation through Jesus Christ the Son, and we have that salvation guaranteed to us through the presence of the Holy Spirit.
Ephesians 1:3-6
Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. He destined us in love to be his sons through Jesus Christ, according to the purpose of his will, to the praise of his glorious grace which he freely bestowed on us in the Beloved.
We know the plan of salvation was designed before the foundations of the world were laid.
The Father predestinated the plan and the Son and Spirit agreed to the plan .
I believe that even the Roman church says she was chosen by the Father
Certainly that's what the angel told her.
The goofiness from Rome continues.
Your explanation of the Trinity would lead one to believe you are a polytheist. God is a single entity (monotheism) with three distinct hypostases.
But He didn't choose Mary to be His Mother, before the foundation of the world, that she should be holy and blameless before Him?
Welcome to polytheism Calvinist style! God the Father is "conferencing" with the Son and the Spirit! I used to think they were Triniatrian Christian (at least in theory). Now I suspect they may be cultists in disguise.