For starters you've assigned a false title to Mary. No where does the Bible refer to her in this manner.
Next, we have no record in the NT of anyone ever praying to those who have gone to be with the Lord.
This is nothing more than the false teaching of mary fostered by the roman catholic cult.
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First of all, why are you bothered by the term I used, "Blessed Mother Mary"? The Bible quotes Mary as saying "All generations will call me "Blessed", she is the Mother of Jesus, and her name is Mary. What in the world do you find wrong with that title?
Next, there are very few records in the New Testament of Christians dying at all, let alone being prayed to, and there are very few prayers actually recorded in the New Testament. (See my post #1254 for my response to a similar question to that which you raised.)
Your last claim is not worthy of comment.