Silly girl or alternative uses for criminals
Now there's always the option here that the webcam light came on when they were snooping, but I don't know if every webcam with a power light only turns that light on when the cameras in use (instead of say, always being on whenever the thing is plugged in even if the driver isn't using it). But if it was on and the camera had a light, and the light wasn't on, these people could be used (whilst inside) to write stuff for the security industry to go after real crooks like those committing multi million pound fraud or holding people hostage and using the webcams to broadcast/record ransom videos