How did the neighbor catch the event?
She's new to having cameras, so has been periodically looking at logs from midnight-6am to see if anything of interest had been captured.
I seriously see this sort of thing at various sites all the time.. best thing you can have is loud IR everywhere and serious looking cam's.
we had a roving gang of guys come around our suburb the last few nights, they basically drove around the streets acting like they were looking at properties for sale(a few nights before a string of break-ins), while scoping out targets and so forth, a whole host of houses in my street have pretty serious systems, our street was one of the few that did not get a "visit" from the gang.
if I had a dollar for each of the times It's been a slow evening so I'll have a quick look at review footage and see folks lazily driving up the street, take a look at the camera's then briskly drive/walk back out out I'd be rich.