The basic rule for all roads, pavements and shared pathways is that whoever is going fastest needs to take more care and needs to be the one who moves safely around the slower road/path user, whether they are coming towards you or travelling in the same direction. Sometimes that's really annoying and sometimes you even need to stop for the slower person whether you're a driver, cyclist or pedestrian.
Celia Ward's death was tragic but I still believe it was an accident and not Auriol Grey's fault. It doesn't matter whether it was a shared pedestrian/cycleway or a footpath - Mrs Ward must have expected to encounter pedestrians on that path and must have known that as a cyclist she was travelling faster than them.
It doesn't matter that AG may have been behaving erratically because of her disabilities, or even if she did it willfully. She didn't start moving faster or change her course. CW should already have stopped some way short of her. There could just as likely have been a toddler or a puppy dicking about on that pathway, or a mobility scooter or a very elderly person going very slowly with a stick or a frame. On shared pathways, pedestrians have right of way and it's the responsibility of cyclists to slow down or stop when necessary.
This was a terrible accident and my heart goes out to Celia Ward's family but it wasn't AG's fault, CW just didn't stop in time. Auriol Grey should not be in prison.
If anyone should be prosecuted then it's the local council. This is a very busy road and even the police could not determine whether it was a pedestrian only or shared path. How is that safe?