2) Mary's role in Christ's coming was an important one. While the Orthodox avoid terms such as "Co-Redemptrix" because that could be (possibly mis-) interpreted as meaning that Christ couldn't have done it with her, we do recognize that she was the singlemost important member of all of His chosen.
Neither of these positions is blasphemous, IMHO.
Something to ponder. Could Christ have done it without her? In a certain sense no. He needed Mary to be truly made man. A theophany would not have sufficed for true God to be made true man.