Mary's seven sorrows/not calling her co-redemdrix

"The seven sorrows of Mary are, 1. The Prophecy of Simeon  2. The Flight into Egypt 3. Losing the boy Jesus in the Temple 4. The Way of the Cross 5. The Death of Christ 6. The Deposition of Christ’s body from the cross 7. Laying him in the tomb. These seven mysteries are an outgrowth of the old man Simeon’s prophecy that a ”A sword will pierce your own heart also.” (Lk. 2:35) This key verse is prophetic–not just revealing that Mary will suffer along with her son, but that this suffering will have an important and meaningful part to play in the whole redemption story." Dr. Longenecker  http://www.patheos.com/blogs/standingonmyhead/sorrowful-mother-and-co-redeemer

in the comment section:Actually, the Church does not call the Blessed Mother “co-redemptrix.” Such a title is not necessary, and the implications of such a title can lead us close to heresy. Here is the official Vatican position on such a title, from when Cardinal Ratzinger ruled on it:

“Ratzinger finds that the expression “co-redemptrix” would obscure this absolute origin in Christ, and departs to “too great extent from the language of Scripture and Fathers.” The continuity of language with Scripture and Fathers is essential for matters of faith. It would be improper, according to Ratzinger, to “simply manipulate language.” He sees in the movement promoting Mary’s co-redemption a “correct intention” being expressed in the wrong way. The Congregation for the Doctrine of the Faith holds that “what is signified by [the title] is already better expressed in other titles of Mary.” And so his answer to the request is summarized in the following sentence: “I do not think there will be any compliance with this demand, which in the meantime is being supported by several million people, within the foreseeable future.” (Seewald, 306).” (fromhttp://campus.udayton.edu/mary/benedictmary.html).

I think that this is pretty clear: we shouldn’t be using this title of Mary. I am a huge devotee of the Blessed Mother, but even I get the willies when someone begins to use this title. Yes, I understand what they are saying, but the potential to cause serious error and misunderstanding is huge when applying this title to Mary, and that is why the CDF chose not to define it as doctrine.

Here is another one commenting on the co-redemptrix
http://menofstjoseph.blogspot.com/2011/05/mary-mediatrix-and-co-redemptrix.html

This one has quotes from Pope John Paul: http://menofstjoseph.blogspot.com/2011/05/mary-mediatrix-and-co-redemptrix.html