I think it's possible she's guilty. She could certainly easily be negligent or careless or just a bad nurse (as could anyone else at that hospital) or she could have been doing her best in a failing unit and you could have had the same outcome.
They have some deaths and collapses every year, so I think the first step is to show without any doubt that the harms she was accused of were definitely deliberate and the ones that she wasn't were definitely not. I think they failed at that step when some incidents moved between suspicious/not suspicious depending on whether she was there or not.
I also think there were a lot of problems with the way the evidence was presented to the jury. There are so many experts in statistics and neonatal medicine coming forward now (who weren't part of the defence team so couldn't speak up at the time) questioning what happened at the trial.
There's also a lot of things that the jury wasn't allowed to hear about - the independent reports, the grievance, the problems in the maternity ward, the unit being downgraded, the other babies who collapsed or died etc. which make me think that poor medical care and looking after too many babies and those who should have been at a level 3 unit are much more likely to have caused the harm.
I'm concerned that the reason that there were so many cases all tried at once was that they were all evidentially weak, but it could almost look like if you weren't sure about part of it then she must have done something to be accused of so much. They're all quite diverse cases too - air embolism, air in NG tube, overfeeding, insulin poisoning, injury to liver etc. To me it doesn't stack up that a serial killer who "enjoyed hurting babies" would use so many different methods (and fail at some too - surely there's not many victims who would be easier to kill?). There's no escalating pattern or victim type either - multiples, singles, boys, girls. If she's a serial killer she's a very unusual one.