I think Mary would help us in preparing us for the afterlife, by giving us some guidance.
Mary was no ordinary woman...God did not just go out and say Eeenie meenie minnie mo.... He had to choose a woman who was pure of heart, to the point of being almost saintly...
So the mother of Jesus, was and is, an almost perfect woman, as far as being holy goes.
This then enpowers her with some powers, I suppose....as a saint perhaps.
But for the most part, people are guided by Mary, to become better people. Mothers can use her as a role model for how to behave and how to be good, and how to keep their minds clean.
My grandmother was a great woman...kind, gentle and would give her shirt off her back, to anyone....my mother and my aunts, would pattern themselves after her. So it is, with Mother Mary.
She has been said to appear to some people, giving messages of good will and of what was to come.
So in that sense, I guess Mary would be an influence to guide us to salvation.