Well, you're calling for her to be made to resign - she resigned of her own accord about a year ago, so it might be worth doing a little more reading up before getting fired up about it.
You say this is not about politics, but I respectfully do not believe you would be interested in this if the Victorian government was of the Liberal persuasion.
There are always procedural mistakes made during major catastrophes like this. That's why they hold coronial inquests, internal post-mortems etc etc. The objective/outcome is not normally that someone is culpable, but rather that there are lessons to be learnt for preparations against any future similar disaster.
With respect to your point about the Chief Commissioner being the Central Commissioner for Emergency Management, the Chief Commissioner is the titual head of a number of responsibilities that involve life or death manners. You can't personally make sure everything is running properly - you'd get nothing done and be counterproductive. What you do is make sure that your Asst Chief Commissioners and Superintendents are focused and on the job and have everything they need to do the job, and then let them do it. There's no indication that she was meaningfully derelict in any aspect of that role.