That RN took hours to formulate and print. So any conversation captured at the end of the 911 call took place hours after the crime. The type of dialog mentioned here makes more sense after she died but before the coverup.
It's off topic for this thread, but I doubt the phone picked up any conversation at the end. If find other things telling about the call:
- She sounded frantic for the police to hurry yet hung up the phone. I would expect someone eager for police help would stay on the line.
- Usually when people encounter a rare crime, they think it must not be real. At many shootings I've heard people at first think it must be an act. There was no suggestion whatsoever of "this has to be some kind of child prank or something."
- There is no mention of concern the perpetrator may still be nearby.
- There is no mention of working with the kidnappers and avoiding doing something that might anger them.
Getting back to the topic, I consider all of these mistakes to be part of a poorly-constructed plan. After thinking about it as much as we have, they probably would have fixed some of these mistakes.
I think the original plan was to make as many false clues as possible to point to anyone and everyone outside the house: a random rapist/murderer, a disgruntled employee, a politically-motivated "terrorist", someone with a personal grudge, anyone but them. I doesn't make logic sense that the same RN would point in different directions. I think this was panicked and not well thought out.