Thank you @Amstorrs for sharing this info.
I work with people that have IDD (intellectual and developmental disabilities), and as a group home manager, I know the ins and outs of the system VERY well.
It varies widely from state to state however, and is very progressive. With Peggy’s mother dying 25 years ago, it wouldn’t surprise me that no one followed up. Even as recently as 25 years ago, most people with IDD were still sent to institutions as children, and caring for your child at home didn’t pay social security benefits that it would now. Because she was at home and likely “off the books” (unless she received other social services), she probably didn’t even have a case worker.