I don't believe Meredith would have ever supported Callie taking Sophia to NYC
I think there is zero chance Meredith would have testified for Callie during the custody trial. The situation so closely mirrors what happened with Derek- he wanted to move them to Washington for his career, she was absolutely against it because in her own words her support system and village and kids life was happening in Seattle and she didn't want to take that away from them. I think it stands to reason that she would find Callie taking Sophia away from her life and friends and other parent equally unacceptable and I don't get why she was so baldly in support of Callie running off with Penny. Like it's wild to me that she didn't draw any personal parallels between her refusing to uproot her own children and Callie wanting to uproot Sophia and give Arizona minimal visitation rights