This is the age old scenario of "ignorance of the law is no excuse to break it".
I don't like NJ gun laws any more than anyone else on this board, but it's what the idiots (or is it morons?) in NJ want by and large.
They elected their legislature. They reap what they sow, and they have to live with the consequences.
This mom didn't do her homework, period. This is no differet than someone who thinks their CCW lets them carry in schools, courtrooms, secured side of the airports and polling places on Election Day. Just because she's from our side of the fence doesn't mean the laws of Darwin do not apply to her too.
And last but not least, I haven't needed to inform anyone of anything in nearly two decades, which just so happens to coincide with the time I stopped speeding and started reading signs. It's not magic, it's the law of averages. Don't call attention to yourself, and you won't need to say nothing to no one either (double negative, I know, I know).