alohaj, regarding the timeline of Nala's being found getting communicated to the family -- last night I did go back and find the posts I recalled on the Find Charli Scott Facebook page. Kim, posting as FindCharliScott, announced they were getting word on Nala while it was still Tuesday night, with the earliest time stamped reply coming in at around 11:30.
So some kind of contact must have been made by Mr. Young of Nahiku or his friend, or the police officer, at or just prior to that time on the 11th. This allows Fiona and Adam to get out there about two hours later ariund 1:30 am on Wed the 12th, which you were rightly questioning as not possible because of the drive time, with the later time given for the arrival of Nala at the officer's house.
Those old time stamps don't change with time passing the way our memories do, so I was happy to find the posts. It's weird how once a Facebook post is more than a day old, it has a date stamp only, but the replies still have the hour and minute stamp.
I have the links to the posts if you want them, on my computer (posting this from phone).