I can't help wondering if Jack had continued to be given Enalapril during his illness (gastro) prior to hospitalisation and if this had contributed to his becoming so desperately ill in the first place.
In addition, it's worth remembering that all this happened in 2011. This was a time before the current campaign for sepsis awareness, standardisation of sepsis protocols etc.
Finally, a comment from beneath the article linked above
From personal experience, Dr Hadiza cared for my son while he was terminally ill. And we could not fault her, not one bit. She was attentive, not adverse to anything that we wanted to try, and fully supported us as a family. When my son finally passed, she came and asked if she could kiss him on his way.
I could weep for the bloody tragedy of it all.