I've done this before, called to have someone check on an elderly relative. In my case, my relative lives out of my state. I called the local police department, explained why I was worried and they sent someone over. It's their decision to send an officer who might call APS if something is amiss, or they could have just sent an APS worker over to begin with. I wasn't told who went, but in the end my relative got a hold of me. Perhaps the friend/neighbor called the police to check on NG when she didn't show up to watch the church service, and they opted to send APS instead of an officer.
Just a thought. IMO.