You might want to consider Matthew 12:46-50. While Jesus certainly had a special relationship with her and while on the cross He fulfilled his family obligation to ensure someone would provide for her, He also marginalized her spiritual significance in this passage.
Mary does not have some special access to Jesus above and beyond other believers in heaven. She's isn't omnipresent. She isn't omniscient. She doesn't have any role in our salvation and isn't some kind of mediatrix (as Vatican II claims.)
We pray for each other because we are repeatedly told to do so. We don't pray people who are dead (in a physical sense) because we are not told to do so, and attempts to contact the dead are frowned upon (Leviticus 20:27, 1 Samuel 28)
Mary is an untier of knots, though, and that’s pretty cool. Funny she never shows up to help when I’m doing embroidery.