For people saying that she would never leave her children/dog etc etc and she's just a normal mum like them she couldn't possibly have done this, or that, or the other - people can and do up and leave their lives quite frequently.
There's a first time for everything, and assumptions of one thing or another leads to crucial theories being overlooked or dismissed.
Someone who wanted to leave their life behind in this day and age would have to have done some watertight planning as to how they were going to do it - and making it look like an accident/abduction is a good way to buy yourself some time to get away safely. Not necessary likely, but not impossible.
There was a very interesting thread on MN last year where a few posters talked about walking away from their old lives and starting again. There were lots of reasons given as to why they did what they did and why it was best not to let their families know where they were.
The case is perplexing - but posters asserting that a person they don't know 'would' or 'wouldn't' behave in a particular way based on their own world view is just daft. There is balance of probability, that's all. The police don't have unlimited resources, they have to investigate the most probable line of inquiry first.
As I understand it, gaining access to data from phone/ internet companies is not something that is rushed through - the bureaucracy around data protection moves incredibly slowly even in high profile cases. The gathering of evidence takes a while.
I've got no skin in the game, I'm just interested at the assertions that NB 'would definitely' have done XY or Z.