Mary is available to those who need her. Many people had unsatisfactory mothers, and she is the person they wish their mother had been.
So you believe that Mary is omnipresent? For if she can hear hundreds around the world simultaneously calling to her, then that attribute would be necessary.
Note that God was wise in that when he assigned to Joseph and Mary their roles, he sent an angel (yes, to Joseph the angel appeared in a dream). When God assigned Moses the role of leading Israel, he spoke directly to him. When God assigns you a role, there is no choice in the matter.
Some are instantly obedient, such as Abraham, Isaiah, Joseph and Mary. Some resist, such as Moses, Peter (during a vision), and Jonah.
Does Moses hear your prayers?