IMO
All signs indicate that something terrible happened in the he house early in the morning.
The noise was so frightening that a neighbour,
who was already used to weird ppl next door (or is it next house?),
decided to call Police.
Now,
add smashed TV to the mix,
a missing girl,
and the picture becomes clearer.
I don't think anybody saw poor PB alive this day outside the house.
And I also don't believe the argument
(which woke the neighborhood)
was about pre flight nerves
or someone angry of being woken up too early.
Nope.
The motive seems to be something that made somebody to commit the unthinkable.
JMO