The shouts about her being a middle class white girl and, because of that, she's getting a more sympathetic hearing than others convicted would have got, are utterly immaterial to this case. Anyone making or repeating those assertions are embarrassing themselves.
The hard evidence to convict Letby has always been thin on the ground, and it's getting weaker by the day. Certainly - if the swipe card data used in her first trial is confirmed as having been 'mislabelled' - the case against her will fall way short of 'guilty beyond reasonable doubt'.
In any case swipe card data is unreliable: lots of times there's holding of doors open for others (as we've no doubt all seen happen at hospitals) rather than doors getting swiped, so that skews data on who's accessing a unit at any particular time. It was always a very dodgy way to convict someone.
Overall: none of the initial post mortems carried out on the babies found that they’d died of unnatural causes. It was only when two senior consultants responsible for this ward got worried about the high mortality rate (which would impact on their careers) did it get off the ground as a murder inquiry and unnatural causes reintroduced into the investigation. The 'whistle blowers' in this respect were looking to set up a scapegoat - a nurse - and the Trust were only too happy to go along with it.
This is a classic miscarriage of justice, but those who've taken up a position against Letby are going to have to be carried kicking and screaming to recognise it.