Agreed, although AFAIK the pizza thing (and indeed the entire Brawley trip) remains an unconfirmed spanner in the timeline. I haven't seen on a map exactly where Audrey's sister's place is, relative to Audrey's start point and supposed direction of travel (I have seen exactly where the car was found). Would be helpful to see that approximate route drawn up, or as much if it as we can infer, if anyone has the time/inclination.
Re: phone pings, I'm a little sketchy on specifics - am I right in thinking you only get a 'ping' when your phone is switched on AND trying to send or receive information? In other words, it doesn't ping while off or idle, right?
Happy to be corrected, but if I've understood that right, then the only way a phone ping can only tell you where somebody *wasn't* is by a process of elimination after it tells you where they *were*. No pings coming from a particular location doesn't really say anything on its own.
I did also wonder if the location of the car might suggest a possible altercation with someone merging onto the freeway 100yds back. On-ramps are a common spot for near misses and suchlike. Although that scenario really would ask more questions than it answers re: where the car was headed at the time, so it's not especially helpful I know.