They don't read nor did they watch the press conference either, it seems.
At the press conference, when they confirmed she was regarded as 'vulnerable' and 'high risk', the journalists specifically asked about what these referred to and the police said they didn't want to divulge this. Presumably the press/media got wind of the background (presumably not difficult to find out), or as above, and so forced the police's hand.
At the press conference they also said that, although not 100% sure, it seems Nicola never left the area/fields from looking at CCTV. The dash cam footage they have so far evaluated has not had a single sighting of Nicola either so they are pretty confident that she disappeared in that area.
As for seeming organised and taking kids to school and making plans - many people who plan suicide can seem normal and in fact better in the days before, often 'very focused' which makes it very hard often for family and friends to process it when someone takes their own life. It was commented that Nicola seemed more organised than usual. Plus alcoholics don't drink all the time.
The 27th Jan was also the day that that biker disappeared (drowned) in the same river 40 years or so ago. Maybe it was planned to coincide with it, or maybe she had seen a notice or comment about the anniversary of the boy's disappearance which triggered her actions?
Speculation but the abductions etc do seem very far fetched if you actually consider the evidence and we don't even have access to the data/evidence the police have.
It was a bit odd how the family kept interacting with the media but in these circumstances, it's not unusual for families to want to retain hope; there is often a sense of 'guilt' even if it's not their fault, but perhaps because they feel they should have spotted the signs. Which is difficult as often, as mentioned above, the suicide victims often seem normal the days preceeding.
Very sad all round.