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If she is the one creating more distance for you to travel, then you can move the court for a credit towards support or you can ask the court to make her pay for the transportation, that is up to the court. There is generally no formula, the court has the option depending on the reason for her move to make her pay her share of the costs to you or the full cost (either directly or through deductions in support, but typically it is by making her pay directly as this is extraordinary expense).