I think that her personality is completely and utterly intertwined with her job. I think her profession is who and what she is, absolutely and entirely, and that her whole life is based around it.
We know very little of her back-story but it seems that she's had the "caring" element to her personality from a very young age. I use that word in quote marks because it was either a mask from the outset or became massively messed up at some point. Then again, perhaps she had the genuine belief that she was being caring in doing what she's been convicted of?
If she really is that obsessively and irrationally connected to her profession then it doesn't surprise me that she kept the hand-over sheets, quite honestly. Nor does it surprise me that she didn't keep things like stuff related to equipment or supplies orders, drug requisitions, etc. I think her deep affinity with her job is related to the human contact nature of it rather than the strict technical or operational nature of things.
A while back the subject of Autism was mentioned but that got deleted for sub-judice reasons as the trial was still ongoing. I am certainly no expert but there must be some type of neuro divergency going on here, surely?
Just my random wonderings so just my opinion, obviously.