The thing about the other deaths/collapses is that, regardless of how much her delusional supporters plead, they simply aren't relevant. They aren't suspicious so they don't have any relevance to the prosecution. The example that Tortoise gave of the ambulance driver smothering his patients having no relevance to the ones who died of natural heart failure is perfectly apt. The heart deaths simply aren't relevant and have no bearing on the guilt of the driver.
The other deaths on the ward in LL's case weren't relevant because they weren't criminal. Once again, it's people putting too much stock in the whole ...the death rate went up... malarkey. This investigation was not sparked because some pencil pusher in an office was collating figures one day, peered over their horn rimmed glasses and had a Eureka moment. It was set in motion, after much push-back, because several doctors and other professionals started noticing worrying coincidences involving the presence of LL when these things went down. It was she who brought the attention, not any sort of statistics. Her fans need to realise that!
We know that the other cases were down to identified causes - congenital issues in something like four of them, for instance - causes which don't open them up to suspicion of criminality.
Another issue I can see is this hypothetical scenario; what if in one or two of these cases the police did actually have suspicions as to whether she had harmed them, perhaps very strong suspicions (not suggesting they ever did), but the CPS wouldn't authorise charges because the evidence didn't clear the bar? If you started going down that rabbit hole then it's anyone's guess where you'd end up. You can hardly have the prosecuting KC present these things in court - it would surely be violating all manner of procedures and rules? Not least the fact that it would end up obliterating any future prosecution should sufficient evidence come to light due to it already having been prejudiced.