> that she was often caught interacting with those babies when she had been instructed not to

This is only a piece of evidence if:

- it's not a common behavior among nurses in her unit.

- she did that specifically to the victims.

Otherwise it could be that this rule isn't applied in practice, or that she is just the kind of people who don't really listen to instructions if they think they should not, which albeit a questionable attitude in an hospital isn't the same thing as “she killed them”.