The fact that Lucy was deemed "nice Lucy", was young, white, reasonably pretty and blonde and middle-class, may well have helped her evade suspicion at first. Even Stephen Breary initially thought, "not nice Lucy".
The list of cognitive biases is huge.
Affinity bias is one.
Halo effect/Physical attractiveness stereotype is another.
So that may explain people's shock to some extent.
If you think of societal discrimination (seen in things like Missing white woman syndrome) institutional racism (racial profiling DWB etc) or the SODDI defence used against men of colour, it's not surprising that many may think Lucy would have been removed from post quicker, had she been a nurse of colour. The counter argument for that would be of course, if management were afraid of union action and being accused of mismanagement/bullying/scapegoating - and iirc Lucy was vocal about staffing shortage issues - then they may have been even more afraid of conflict with a nurse who came from an ethnic minority/BAME.
Authority bias is the interesting one in all this.
Usually, consultants would have more power over nurses.
Their word would be taken over nurses.
They would be believed more.
Yet in this case, that didn't happen. Whether that was because the chief exec had a nursing background himself, they all thought the NHS was crumbling and it was a result of being overworked, they all thought the consultants were covering up errors/mismanagement "convenient for them", they couldn't afford nurses/consultants divide, it is an interesting departure from the norm.
These are the people who need to account for themselves:
Tony Chambers chief exec /resigned Sept 2018 NDA
Ian Harvey medical director / retired to France Aug 2018
Alison Kelly chief nurse and safeguarding lead /suspended from current job
I'd also question Karen Rees nursing director left NHS 2018 / threatening legal action against critics as claims was in the dark, Stephen Cross who allegedly thought it would bring the hospital into disrepute and Dr A for sharing confidential emails with the perpetrator.
They'll all be looking for ways to cover their backs.
"I referred/phoned/escalated/emailed" but at least two babies' deaths could have been prevented.
As to why Lucy started 2015 (and it's more likely she has prior to that) isn't it because she didn't qualify as QIS until April 2015 therefore had less opportunity?