This is a terrible and very sad story...
With regards to pre-eclampsia, from my own experience it can turn into a crisis terrifyingly fast.
In the last two months of my pregnancy I had repeated UTIs, massive water retention etc but because I have low blood pressure it was registered as "normal" and that was why it was missed. At 35 weeks I started projectile vomiting and insisted on going to hospital as I just knew instinctively something was wrong. My partner and family thought I was over-reacting as recent medical assessments had said everything was fine. I was induced within 24 hours and was told it was 50 / 50 survival chance for me and my DS. Never been so terrified in my life. We were extremely lucky.
I'm white and also a negative blood group which is associated with low blood pressure - my Mum was the same.
It sounds as though this terrible tragedy probably has many factors involved and it baffles me how these things can happen in such an allegedly advanced civilisation. Or rather I should say it angers and frustrates me because often it is because women are dismissed as over-reacting when raising concerns.
Obviously we don't know exactly what has gone on here, but I really hope it hasn't happened because a doctor thought they knew better at some point....