So. Neighbours hear argument. Hear smashing crockery. Decide to call the police and to record what they can hear as evidence.
So far, so straightforward. If you suspect a crime is being committed, you should call the police.
The police attend, decide that nothing is amiss.
Neighbours sell/give recording to newspaper (not sure whether money did change hands). This is the bit where I suspect the motives of the neighbours. At no point in any guide to dealing with domestics is "contact newspaper" mentioned.
Then there is the mob gathered around her address.