Sorry to be brief/terse, but no, every one of your points are incorrect
Won't bother retyping after replying yours as I've typed literally all of this out before and no one bothers reading before deciding to be confidently wrong..
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CPS looking at evidence doesn't amount to legal scrutiny – again, their judgment re the evidence is how realistically probable conviction is. This is different to the test the court applies at trial (and don't confuse it with balance of probabilities legal requirement etc either)
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CPS' other test is public interest – re this Wimbledon case, their statement specifically referenced the public interest as well
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Involuntary manslaughter
Before you decide to issue your own judgment on recklessness, negligence etc based on Dr Google, pls read my earlier post.. Eg automatism may not fully apply as a defense here if for example we looked closer at her extent & duration of minor symptoms on the spot and on a wider timeline even if that had been her first epilpetic incident per se.. She might have had a very hard time at trial!
Obvious other simple one would be Road Traffic Act, likely what they were looking at first but would be harder to apply here
Yes it's true she would prob have walked free from court (esp on policy considerations), but it's not as simple as simply declaring "no negligence" or "no recklessness". Firstly, the definitions of these 2 concepts have been subject to great debate; secondly, she might be found to have fulfilled those requirements but with a defense. Finally, legally there are also things like the concept of causation, strict liability, etc (cc @Scruffily since you asked) which means the law is about more than moral blame
Lastly, tort tho civil not crim – we might see those families successfully pursuing that route, though these are well-off families so not much point in that