Contempt is a violation of a known court order. Does your Parenting Plan specifically require her to give you her address? If not, that may not be contempt.
There is a provision of the law (with notice in your parenting Plan) that a person not relocate the child without first giving notice. She has not done that. The statute does provide contempt and other sanctions as a remedy. Her relocation has apparently not interfered with your residential time, so it is unlikely the court would find her in contempt over this, essentially finding what is the harm. If you were harmed, the court could consider sanctions.
Her relocation can be an additional basis for you filing for a modification.
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