The fact that this happened on a Saturday night and not Sunday when the moon was actually full, might - in my own thinking - indicate someone who had to work on Monday. I'm wondering if the homes of other elderly people in the area have been broken into on bright nights?
Was NG's hearing better than the average older person? Did a noise awaken her and she went to investigate?
The thing is, though, people who have lived in their homes a long time have things stashed away they don't see on a daily basis. A burglar could break in, take something, and it not be discovered for weeks, months, or never.
However, that would indicate the burglar would have knowledge of those items.
I would think the electric company who did the last work at the home is being scrutinized very closely and any elderly clients being contacted. But, if they never woke up and haven't noticed anything missing, they won't be much help.