I'm just using your post, not necessarily directed at you..
Every one keeps assuming her watch must have been on the charger. When Harvey has talked about the watch, he never mentions a charger, at all. It's quite possible she was wearing it and was made to take it off or was taken off of her.
Harvey Levin, love him or hate him, said that it was so very specific that he believes that its possible it's real and written by whoever took NG.
FYI: I wear my smart watch to bed, I have a pattern of when and where I charge it too, but it's during the day. My watch is so smart, it will tell me when it's just about that time for me to put it on the charger