The concept of Mediatrix has Virgin Mary in a role of a mediator in the salvation process—at least that's what Wikipedia says:
Mediatrix in Roman Catholic Mariology refers to the role of the Blessed Virgin Mary as a mediator in the salvation process.
From my admittedly biased point of view, this seems to clash with Paul's writing about Jesus being the only mediator between man and God.
1 Timothy 2:5-6 (ESV)
5 For there is one God, and there is one mediator between God and men, the man Christ Jesus, 6 who gave himself as a ransom for all, which is the testimony given at the proper time.
What is the Catholic teaching about the Mediatrix concept? How is this passage interpreted? Do all Mariologists take this passage into account?