I haven't read the link abbey but I have heard the news coverage. The relationship between the mother and her daughter broke down when the daughter was 17. It seems the daughter is still married to the "unsuitable" boyfriend who was the trigger for the fall out and the couple have five children together. The daughter argues that she tried to reconcile with her mother but was rejected. It's very sad of course and rare for this kind of estrangement to continue throughout life but am I alone in feeling it's wrong that the (grumpy) mother's will was not adhered to?
It seems that because the mother inherited from the daughter's father, the court took the view that this meant the daughter was entitled to some of her legacy.