The neighbor has no way of knowing what the grow is for, if it is personal, or if it get's sold via gangs or whatnot. To her the plant is illegal for a reason, and a such she reported it for a reason. Governments do a very good job of putting bad images in peoples heads with regard to things like cannabis. So far as the neighbor was concerned, she was doing a good thing and acting in a correct manner and helping society. It might surprise you but there are a lot of people who do not consider cannabis a harmless drug without any negative repercussions be it in terms of the health concerns, or the links to gangs, violence or whathave you. If she beleives it to be a harmful drug, then she had every reason to think that it would be good to report the grow and as such stop it getting into the hands of say her children, or relatives or such.
In short she may have had reasons which to her were perfectly valid, which you have no idea of or appreciation of, and as such you are recommending to fuck with this womans life. You do not sou/nd like nice people. I think i'd rather have her as my neighbor than you lot..