Some ideas- rope, zip ties, tape, tarp or something to wrap her in etc.What in your opinion, was in it? Could it have simply been an internal frame?
In a kidnapping scenario, it would make far more sense to follow the victim until they are somewhat isolated, right?
This criminal looked incompetent, in that he was playing with the doorbell camera, and forced his way in. Why go through that just to kidnap someone, when you could grab them outside a store or while they are on a walk?