It is unfortunate that the rape was not reported to the police sooner since it sounds like the victims were terrorized by their rapist. However, I’m not sure that PP was required to report. The girl was 15 at the time and the rapist was 17 or 18. Arizona statutes define the crime of sexual misconduct with a minor as:
Sexual intercourse or oral sexual contact with someone at least 15 years of age and less than 18 years of age where the defendant is at least 19 years of age, not attending high school, at least 2 years older than the victim, and not the victim’s spouse.
but the statute regarding mandated reporters also has this:
it only refers to those cases where the abuse occurred as the result of an act or omission on the part of someone having care, custody, and control of the child.
What the perpetrator did was criminal but it doesn’t appear that the PP worker had an obligation to report. What she did was falsify documents in order to avoid complying with the law as a mandated reporter. I don’t know if that is criminal or unethical or both. The girl or her mother (who accompanied her to PP) could have reported it to the police anytime. Rape/sexual assault do not have to be reported by mandated reporters in all cases and the conditions that require reporting vary depending on jurisdiction. That’s what I’ve gleaned from the information I’ve found.
Also, FYI information on reporting sexual assault to the police.