Satanic nonsense. Mary herself called herself blessed. Mary was full of grace because she needed grace, she was not a perfect vessel.
When the woman in the crowd called out "Blessed is the mother who gave you birth and nursed you" Jesus replied, “Blessed rather are those who hear the word of God and obey it.”
When Mary stood outside, Jesus pointed to his disciples and said they were His mother, sister, and brother.
The Catholic church is the church of the Pharisees that Jesus warned you about.