I'm not sure I agree. One of the requirements for an adult citizen in a civil society is to be reasonable in your dealings with neighbors.
> It is, however, the police's, DA, and CPS's job.
"Mentally functional" does not necessarily mean "giving citizens a break". The criminal law that the mom was charged with is a law, it's on the books, and law enforcement is supposed to enforce the law. They do have a certain amount of discretion, but the incentives they are facing, particularly in a community which is strongly in favor of "law and order" (which I suspect the one in question is), are against their exercising discretion in favor of a citizen. And putting the "sex trafficking" thing into the mix just makes it worse.
The only real way to fix this is to remove things like this from the discretion of law enforcement by not having a law like this in the first place. (Unfortunately, it appears that when the law was revised to allow kids more independence, they only revised the family law code, not the criminal code. They should have revised both. So I would say the ultimate fault here is the legislature, for being incompetent when making law.)