She didn't remove the breathing equipment for cleaning, she removed it for a photoshoot, which is illegal. Period. It's also deeply, deeply creepy.
Your last sentence is simply a flat out lie with no sources. Multiple people who knew her described her as aggressive, hostile, or odd.
She absolutely perfectly fits the profile of a female serial killer - someone who cannot connect with others, with no dating history, who has a history of inappropriate behaviour, and commits murders via a caring role.
The three separate people who walked in on her standing over a baby in distress (two of whom experienced her anger). There's no justification for that.