I am worried about Nancy.
First, I am going on the assumption that there wasn't much blood on the porch. LEO didn't say the porch was awash with blood. The big thing here is that if someone bleeds out (which they do from time to time when they are murdered) the area is awash with blood.
Second, even if her meds are literally keeping her alive from day to day, by now not having them has generated two major problems. #1 is she could have a heart attack or a stroke from not taking her meds. #2 is the amount of stress and terror she is likely going through could also cause her to have a physical reaction that is not compatible with life. So I am worried that during this time she may have died and the kidnapper(s) dumped her body somewhere in Mexico.
I'm probably on similar medications to Nancy. I know I would not die if I didn't have my meds for a short time, like the typical 5 days I can't take them before surgery. I also firmly believe that my meds are keeping me alive.
Third, I am certain LEO knows more than we do. They always hold something important back. BUT no matter what they know, it doesn't seem to be providing a speedy resolution to this case. I think the biggest problem is that there are no super helpful clues.
Maybe they should send ICE to Mexico to help find her. They aren't concerned about being law-abiding, so they can get away with doing more than the FBI and police can. First, Nogales, Mexico.
Maybe, hopefully, they've put up drones over desert areas and other places where they would be helpful.
I am really concerned about her and I hope she is well. I keep visualizing her being found in pretty good shape, and taken to a hospital for a few days before returning home. If they catch the criminal(s), I hope they rot in prison.