From what I've seen there's been a lot of reporting on her case, and how Vandy rightfully deserves a lot of pain, and a lot on how a subset of nurses feel she's been railroaded, but I've not seen what you claim and would like to know where I missed it.
I'll also re note that pharmacists have carried this burden for over a hundred years, and their removal from the process is part of how this chain of mistakes happened to begin with.
From the article:
"pursued penalties and criminal charges only against the nurse and not the hospital itself...Vanderbilt received no punishment for the fatal drug error...appears to support defense arguments that Vaught's fatal error was made possible by systemic failures at Vanderbilt."
That certainly seems to lay claim that there are more issues than the single nurse. Holding others accountable doesn't negate her culpability but it would prevent her from becoming a scapegoat.
When you have millions of drugs being issued, there will be some legitimate mistakes happening -- some will even cause death. If you want people to actual work in healthcare, they shouldn't be fearing for their lives for being less than perfect.