Respectfully, we don't know what she did or didn't do. She didn't have him put in an institution. Could have been because the waiting lists to get him in are literally months to years long and many times, no matter how much money you have, if your insurance won't cover it, you aren't getting through the door. We don't know if he was under treatment of any kind of doctor because HIPAA prevents the release of any kind of record of that nature, even now that he's dead. Even if she put him under the care of a doctor, if you don't show up or refuse to participate in your own treatment, many of them will simply remove you from their patient rolls. She couldn't drag him to the doctor kicking and screaming, he was an adult. Even if she did, she couldn't force him to talk.
He was an adult. He was not in school. There is very little that she could have done about her son's condition, at the age he was at. In fact, she would have had very little she could do for the past two years, so I really don't see why everyone keeps blaming her.