Obviously we will never know her true motives. But the prosecution hinted that she liked the drama and sympathy, and she felt disrespected when less experienced nurses got placed in nursery 1 instead of her.
Perhaps one day, a baby in her charge died purely by chance and she liked the sympathy she received. She wanted to be with the sick babies where she had more of a chance to receive that attention and sympathy or act the hero. But nothing happened. So she decided to make it happen herself.
Maybe she didn’t intend to kill or cause long term harm at first. She perhaps made a baby desat and intended to revive them but it all went wrong. And then she realises that she doesn’t actually feel fear or guilt about it. Or the attention & sympathy she receives outweighs the guilt she might feel. Or she gets a buzz from it that becomes addictive.
And then she starts to get the huff because less senior nurses get her prized room 1 shift. So when they go out on their break she sabotages their charges. The designated nurse comes back to find their baby ill and desaturating, and they panic. But low and behold, cool and collected Nurse Letby comes in from no where to save the day and shows everyone how it’s done. Sometimes she ‘saves’ the baby and is a hero, sometimes her efforts are in vain and her colleagues console her saying she’s an amazing, dedicated nurse who tried her best. All eyes are on her.
Then she has her doctor love on the side. She hasn’t seen him for week due to being on holiday. She asks if he’s on the unit on her return but he isn’t, he’s on clinic. But he’s the ‘on call’ doctor. She knows if she makes a baby desat he will come running to the unit to assist and they will save the baby together or else they will comfort each other if they are unsuccessful. Regardless, she still gets to see him and get his attention and sympathy.
During one attempt it was noted that she received a needle stick injury and had to go to A&E. She proper milked it when she messaged her doctor love and made a big deal about fainting and being overly feminine/damsel in distress.