This is my take on it too, even with the serial killers' childhoods perspective.
There are definitely points in her story that can be viewed in a sympathetic lens, but her actions and reactions to those story points are what makes her irredeemable, in my opinion. Let's not forget, she's the one who took all that intelligence and potential, then decided to run with it for her own twisted and selfish reasons. For literal ages. Honestly, it's the obsession that scares me the most with her.