If guilty, I think June 2015 may have been an escalation, rather than the very beginning. They are still investigating the time period before June 2015. The "first" crime, Baby A, is very bold for an absolute beginner: allegedly attacking the baby at the start of her shift, while in the same room as another nurse who was occupied on the computer with her back turned. Also allegedly attacking the first four babies in a very short period of time. This is not a beginner crime IMO. This is the point when a serial killer gets too comfortable, and starts taking more risks because they are over-confident, and because they need to do more and more to get the same "high".
If guilty, prior to June 2015 she probably attacked babies occasionally, when she felt comfortable enough. It would have taken time to pluck up the guts to do something wrong, then eventually to do something major. It wouldn't surprise me if she started with more minor attacks (rather than fatal), getting thrills with occasional sabotage, testing the waters to see what she could get away with, and to see what the babies could withstand. I think Letby's "fate" comments are significant, and creating risk for the babies with treatment sabotage to test out their luck may have been how she started out. I would be willing to bet, if guilty, there are many more babies who were attacked or sabotaged, but who survived unharmed.
Anyway what I'm getting to is that I doubt there was any particular trigger. IMO this seems to me like the sort of crime that builds up over a period of time, from someone who always had the propensity to do it. If found guilty, I would even think that she became a nurse specifically to have the opportunity to play God, even if at the beginning, it was just the feeling that people's lives were in her hands, whether or not she definitely intended to do anything bad at that point.
If guilty, prior to June 2015 she probably attacked babies occasionally, when she felt comfortable enough. It would have taken time to pluck up the guts to do something wrong, then eventually to do something major. It wouldn't surprise me if she started with more minor attacks (rather than fatal), getting thrills with occasional sabotage, testing the waters to see what she could get away with, and to see what the babies could withstand. I think Letby's "fate" comments are significant, and creating risk for the babies with treatment sabotage to test out their luck may have been how she started out. I would be willing to bet, if guilty, there are many more babies who were attacked or sabotaged, but who survived unharmed.
Anyway what I'm getting to is that I doubt there was any particular trigger. IMO this seems to me like the sort of crime that builds up over a period of time, from someone who always had the propensity to do it. If found guilty, I would even think that she became a nurse specifically to have the opportunity to play God, even if at the beginning, it was just the feeling that people's lives were in her hands, whether or not she definitely intended to do anything bad at that point.