Well maybe inadvertantly you have just proven that praying to Mary is unbiblical.
Nobody said praying to Mary was in the Bible.
If "unbiblical" is supposed to mean non-biblical, every Catholic on this thread will agree with you. If it means anti-biblical, then it's up to you to prove that, and we already know you can't do it without appealing to something not in the Bible, such as an interpretation.
If you can go outside the actual text of the Bible such as with interpretation, then you don't have a leg to stand on when you say we can't go outside the actual text with our Sacred Traditions.