If there is a visitation determination, then make a petition for modification of visitation. If you do not have a custody order in place then file for custody and address your concerns in Court.
You can speak to local law enforcement and see if they determine that the actions rise to the level of a criminal action. If they believe it does, you might be able to obtain an order of protection that would keep her away from the property. Good luck.
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Call the police and request to file a trespass violation complaint.
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You should call the police the next time the person is on your property.
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