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Hoooo boy. First off, I'd try to get your fiancée into therapy. I'm not a therapist, but it sounds like she could be suffering from PPD.
I would (quietly) get a good divorce lawyer and try to get written statements from her pediatrician that it's you that brings your daughter to the...
Name: explodingdaisies
Tiers Played: all
Primary Eligibility: US East
Secondary Eligibility: None
Interested in captaincy: If needed
Significant Time Missed: No