I think both things can be true. She did, IF guilty, try multiple times to send the child to the brink of death. That is attempted murder.
But I do think she enjoyed the process, of the child being on the brink, and all that entails. Just my personal opinion. I could be wrong.
But it could explain why she quickly points out babies who are about to collapse. And why none of the babies were found dead. I believe if she really wanted to, she could have given them triple the amount of air, or insulin, once the first few collapsed instead of dying.
I don't think she was setting out just to kill outright. I think it was more complicated than that. JMO
This is my opinion too.
Sadly, I believe she enjoyed the attention and drama that a struggling baby created and the 'excitement' and the role it gave her in it.
In order to perpetrate this type of behaviour she would need to have a very serious empathy deficit / lack of empathy and only be able to conduct 'performative empathy' or 'cognitive empathy'. Only the people who know her best over time would be able to comment on that and she would need psychiatric evaluation.
Maybe photographing the cards etc is part of the performative aspect for her and also helps her memory if she doesn't actually care because she hasn't the same feelings as an average person.