My one and only problem with the "fear" story, is this;
Lets say I was so terrified for my life and the life of my children that I felt I had no other choice than to do what PF asked. My primary loyalty is to my kids and protecting them. I would do anything for them.
So I do what he asks, because now I am even more terrified, he has already killed one woman (KB). I take the phone and i do what he says and drive it to Idaho.
If i was so terrified, I know he has killed once. There is no question I'm not safe even if I do what he asks re the phone. So I drive and take that phone to the nearest major police station and tell them everything I know.
She had everything to gain by going to LE, after she had the phone. Protection from the person she apparently feared the most. Protection for her kids. He wasn't holding anyone hostage until she completed her task. Maybe LE wouldn't have believed the solicitation stuff, but KK had KB's phone and the police would not be able to find KB.
That she didn't go to LE after she had the phone, is the nail in the coffin for me. Can't wait to hear how she answers that when the defense team grills her.