Who the duck writes “I killed them on purpose because I’m not good enough to care for them”? Definitely not an innocent person anyway.
It’s a confession note, there’s no two ways about it. It’s the smoking gun. It was a total golden nugget for the police to find.
It's a weird thing for a psychopath/sadist to write, and I do believe that is what she is. All the theories about wanting to be the centre of attention, narcissism, Munchausen, Dr NoName etc may have played a secondary role... but to me the main cause is that she is the typical serial killer: a psychopathic sadist who got off on the power she felt ending a human life. The trophies, the Facebook searches, the time she was standing over a dying baby without calling for attention watching them die..., even the way she made the doctors squirm in the mediation meeting, all that is consistent with a psychopathic sadist and less so with the other theories.
So I find the stuff she wrote in the notes quite odd, since some it even seems to indicate remorse. Which we know 100% she didn't and doesn't feel. My best guess is that these notes were ideas of what to say to the hospital bosses when describing how the wicked bullying doctors' accusations make her feel, the distress they've put her through, how they've made her doubt herself and her sanity. We know she must have laid it on thick for the hospital, because they were falling over themselves to make things up to her with those offers of master courses, the forced apology letters from the doctors, etc.