Good point that sometimes a lack of phone activity will also tell us a story. So if both KK and PFs phones go silent for a few hours that day/time she arrived it would imply they may be together at a secret meeting place.
When I have more time I want to share some theories about KK's deal with LE. The main one I have is I think LE got duped a little bit by not realizing her level of involvement.
I've been researching how these sorts of deals are made and one thing that typically happens is the defendent does not spill their information until the deal is signed in ink. That is their big bargaining chip and so they dont give LE much of anything until the ink is dry with signatures.
I think what happened is mainly a couple things.
LE solely needs KK to help convict PF. That was their goal in using her for the deal so they asked her 1 important question before making the deal and before hearing all her "stories".
"Did you kill KB?"
Answer from KK "No"
Once LE heard that she did not kill KB then they felt confident they can make a deal because she was not the murderer. They would even have that in the wording that if LE finds out she did kill KB then the deal is off.
But what happened after the ink was signed is when the details came out about how much support she gave PF and helping clean up the crime scene, I think LE was about as floored as we were.
It doesnt change much for LE except to make them look really bad that they gave her such a good deal. But LE still gets what they need from KK. Someone to help put him away and they also got information that filled in a lot of the blanks.
Anyway thats my main theory on it.
I could be wrong but this would explain a lot to me of how things went down.
I think LE will unfortunately let KK slide if they find out on smaller lies. I think the contract is mainly on the big stuff. Like if she did actually have a hand in the killing part. That would be a deal breaker for sure. But some of the falsehoods I think LE will unfortunately let her slide because they still want what is owed to them from her. And that is to get up on that stand and point her finger at PF and say to the jury "Yup thats him".