For the record, that WOULD be an anathema. Who told you such nonsense? It certainly didn't come from the Catholic Church.
It came from THOUSANDS of Roman Catholic websites which say a whole lot more than that about Mary's supernatural powers.
It came from the RCC catechism which has been posted dozens of times by me and others to show the RCC considers Mary to be an active participant in Christ's redemption of the world.
It came from the words of John Paul II who blatantly called Mary a "Co-Redeemer."
It came from Padre Pio who is about to be canonized who stresses over and over that Mary is a "Co-Redeemer" and a "Dispensatrix of all graces."
If these sentences bother you, good! They should. Work to rid your church of this idolatry. God will be glorified as Mary decreases from your sight and Christ appears.