If this 3rd murder attempt was ‘dropped’ (or whatever it’s called) now it would make me think that other potential cases were not brought to court because of lack of evidence.
There is no documentation. I’m almost certain there would be text messages relating to this. It’s such a ripe gossip subject, IMO. If there are, and the police haven’t disclosed them that would really make me wonder, not cast doubt on her guilt, but make me suspicious of their tactics. If there are no text messages that casts doubt on what the other nurse is saying.