I haven't followed the case enough to say either way but what is written here has made me wonder about the possibility of her being framed. Not necessarily because someone else murdered the babies, but more perhaps hiding the hospital's failings so taking the heat off themselves.
It sounds ridiculous, but I've been in a bullying situation at work where I can see exactly the framework how this could happen.
I had one person who commented about bully 1 in a meeting "I don't agree with that, but if he wants it, they it will be passed". A year later they told me "no one is influenced by him, we all know our own mind."
They went from recognising he manipulated people not not recognising they'd been manipulated by him and believing everything he said without question.
I was often framed by them, by things like they'd say something needed doing and I'd say "oh yes, not a problem. Would you like me to do it?" And they'd say "Oh, yes please, that's great." So I'd do it, and next thing would be my line manager would call in to say "you really shouldn't have done that. You should have checked first", but I had no witnesses, and when I said "he asked me to do it" I was clearly not believed. Then I'd have other people commenting to me "you know you should check before doing this", and he'd phrase it so it sounded like he was so patient and I was just doing it my own way without any thought, despite me having talked it all through,
If I said I didn't have time to do it, or similar, he'd reply "no problem, totally understandable" then I'd get my line manager saying "you know when bully 1 asks you to do something, you should do it."
So I couldn't win.
She could have been manipulated into dealing with babies that had shown signs of deteriorating. Other person looks at baby, sees signs of deterioration, thinks "doesn't look good". Says to Lucy, "Lucy, can you look after Baby A today.". Then comments to another person "Oh I feel so sorry for Lucy, she asked to look after Baby A just before they died. It's funny, but when I saw baby A they were doing so well. Strange how that happens sometimes isn't it?"
And also being guilty gives you an edge over everyone else. Generally people don't like accusing people, and will tend to think the best. That actually gives them the best chance of not just hiding their guilt, but also of framing someone else.
If someone was trying to hide it, then people say "weren't you doing baby A's medicine?" and they reply "Oh yes I was, I gave it to them and left Lucy watching them on her own. She's lovely with the babies."
Or "Oh yes, I was meant to handle the food bags yesterday, but when I came in Lucy offered to, she could see how busy I was, so I left her doing it."
The listener will assume the person is just talking, because why would they say Lucy was there if she wasn't... then if Lucy says "but they asked me" or "I wasn't there" they see it as a sign of guilt.
And actually Lucy may not have even tried to defend herself. She may think "they're mistaken", "they didn't mean it the way it came out" and things like that. I thought like that for over two years before it became obvious that it was deliberate and targeted. I just thought I was being paranoid when it felt that way.
Ime that people very quickly pick up that and even start thinking that they personally saw Lucy doing whatever etc. People would swear I'd been in a place at a time I wasn't in the building, even on one occasion I pointed out I'd been talking to them as I left earlier. They responded "well, you could have come back, I suppose." Even when I said I couldn't possibly as I was on a train 40 minutes away by that point, they just thought the bully had been mistaken on times, not that they were deliberately setting me up.
Because they're not thinking the speaker is anything but totally innocent, they don't see that they would say anything that isn't true, so believe them.
Yes, people will look at this and cry "conspiracy story", and I'm certainly not saying that is what happened, or even what I think happened. However from my personal experience, I would say that it is possible that if someone, especially someone who was superior to her, wanted to frame her to either deflect attention from themselves or the situation in the hospital, I can see how it would happen.