It’s possible PF asked KK to do it, and later told her to forget about it and she rationalized it and wrote it off. It’s possible PF didn’t do the job. It’s possible KK knows this because she was with him all the time and is his alibi. It’s possible once she realized KB was missing and PF didn’t do it, she realized she was also at risk of disappearing. It’s possible he planted the phone on her as a warning. It’s possible someone else entirely had the phone, and the ping so close to her was terrifying, because she assumed the killer was out there and close to her. It’s possible she was threatened with death or harm to herself and loved ones. It’s possible she didn’t go to LE, out of fear. It’s possible she did go to LE. There’s too much we don’t know.