As part of the criminal court process, the defense has a right to what is called "discovery", which basically means information from the prosecutor about the evidence in the case.
Your lawyer should be able to get this information and then discuss it with you.
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There are several elements to this charge that an attorney will review with you. It's important, however, to understand that the overarching purpose of this law is for responsible adults to protect the children precisely because there are "decisions" that children should not make and circumstanced they should not be in. The primary questions will probably be: 1) in whose care was the child?; and 2) what would a reasonable adult do under the circumstances? An additional factor may also be what happened after your young cousin made her "choice" that led to the charge.