There is no judge making a determination at a mediation. A mediator is only a facilitator. They do not take sides and don't make decisions. They are only to try to help you and your spouse try to reach an agreement.
I assume that the court appointed a guardian ad litem for the child. Typically the GAL has to participate and Sign off on the agreement reached at mediation .
I agree with attorney Valdes. Given the facts I urge you to hire local counsel. You want what's best for your child. An attorney can make sure the Court is properly and completely informed
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