Can you explain Mary as Co-Redemptrix?

Something I came across was Mary being seen as a Co-Redepmtrix. How much latitude is there in the RC’s stance on Mary for this concept to exist? Also I don’t quite understand this subject and frankly it sounds heretical. So basically are there varying opinion’s on the subject within the RCC and if so can you direct me to a detailed explanation of each?

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**Recommended Reading:
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[LIST]
*]What did Mary’s sufferings merit for mankind?
*]Mary as Co-Redemptrix
*]Is Mary our Co-Redemptrix?
*]What is meant by Mary as Co-Redemptrix?
*]Am I required to believe Mary is a co-redeemer with Christ?
[/LIST]

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