Yeah man, you have to report her, but you also need to protect your ass.

The basement of a duplex would be a common area, so if they arrest her they have every right to search it. They MIGHT not find it, but given the penalty if they do its not worth taking a chance. Move em, or just scrap this grow and start up again after shit blows over. If the cops find it, you can bet they'll do it for you.

I'd probably be scared of her too. Abusive moms get pissed when you try to seperate tehm from their kids. But you've got to do what's right for those kids, because otherwise they'll just turn out to be screwed up adults who abuse their own kids. The cycle continues until someone breaks it.

I'd report her for the Section 8 and welfare violations as well, but maybe that's jsut me.