"Yeah, you're so right, Mary...I should just roll over and play dead."

No. Calmly and methodically make the phone calls to the various agencies until you find the one that is responsible for providing this service. If your goal is to help your mother-in-law, do it. If your goal is to have another hysterical rant at the invisible "Them" who seem to plague your very existence, then leave the poor old lady out of it.