Just thinking about the urges and LL apparently bot doing anything up the when the first charges were levied in 2015.
I guess we don't know if she was doing smaller, lower level stuff over the years which just escalated over time. She could have been doing minor things to inflict pain, or moving probes and putting them back quickly before babies deteriorated enough o collapse and perhaps built up some courage and urges to take it further.
Or she could just be completely innocent. Time and evidence will tell I guess.
But i do think that if she is guilty, then it is more likely she was doing lower level, undetectable stuff which didn't lead to crashes initially and slowly built up to the worse things, rather than just jumping strsight to murder/attempted murder. Similar to Wayne Couzins flashing etc in the earlier days.