Your first step should be to get to the police department as quickly as possible. If your child calls you, tell them not to say anything until you arrive. Let them know that it’s okay not to answer questions. If a police officer calls you, make it clear that they are not to question your child until your attorney arrives.
Once your attorney is on board, let them speak to the police and prosecutor on your behalf. Under attorney-client privilege, your child can speak to your attorney in the strictest confidence.