The pacemaker would stop transmitting as soon as she got a certain distance away from her Apple Watch (like 30 feet from what I can gather). Blood can be there even if she was carried out badly injured, or even dead.
I've seen law enforcement say "we believe so and so is alive" in countless situations, despite their actions telling us that they believe someone is dead.
In no universe do I personally believe she is alive.
Ok how about this though: Last night I was imagining the kidnap in my mind.
I was thinking about the cameras.
Thinking how
unlikely that perps would make a plan that involved her answering the door, and the alleged amount of time the perp was in the house (45 mins).
Breaking in via that protected front door, or knocking on the door, gives the person inside time to press a panic alarm, or dial 911. Too high risk.
It makes much more sense to sneak up on her while she is sleeping.
Speculating that it could in fact have played out more like this, FYI my theory requires more than one perp:
1.47 am perps disable front door cam (because they know they will be removing Nancy via front door and want to protect their vehicle)
1 perp goes to bring vehicle up to the house while other perp(s) begins breaking and entering via
back door (lighter security, quieter)
2.12 am by this time perps are inside the house, either they are not aware of further cameras but they got lucky - no footage retained, or they removed other cameras (this info is unconfirmed by sheriff)
They enter Nancy's bedroom and disable her in her sleep, carry her out to a vehicle. She is on blood thinners and frail, and the act of removing her causes her to bleed.
2.28am by this time she is out of the house and at least 30 ft away in a vehicle
That would mean potentially a window of only 16 mins, not 45 mins as suggested by media.
I'm remembering the sheriff mentioning her being removed from her bed early on, and wondering if this was a slip of accidental information revealed that the FBI didn't want the public to know, so they walked it back.
ETA: actually one perp could achieve this with planning