Yes - I was thinking along these lines. The car has been stopped off the main carriageway; 2 figures are spotted (not necessarily together - her still walking/perp “lurking” somewhere but also semi-discreetly, still visible as headlights of other vehicles/buses go past so spotted on cctv). In any event I wouldn’t be surprised if whatever happened wasn’t actually caught, but the proximity of these figures, one certainly being her, followed by her absence from any kind of cctv after the event means that even without spotting them together, chances are the owner of the car would have to have been the last person to see her. And i imagine this could all have happened in under 2/3 minutes or perhaps even less. (Not the busiest of bus routes at 9.30pm, and despite lockdown there are still a fair few cabs about it maybe not as many as usual). I think it all happened v quickly - but whether or not the whole event was captured on CCTV is irrelevant. Circumstantial evidence creates a pretty good idea of a chain of events. There may not be anything found at the Poynders Road site - but since it was her last observable location they needed to send forensics there to see what, if anything they could find. It was clear LE were mostly focussing on the pavement/road area out front, and later the grassy railing-ed in corner covered by trees.
What it is a salutary lesson in through is either seeing things with your own eyes or waiting for police confirmation of events. I had friends living locally who were frantically whatsapping that eg boyfriend of a friend saw them recover a body. Apart from the fact it would never have been recovered from the crime scene that quickly so I immediately doubted it, some people are way too quick to jump the gun on social media (myself included). Same goes for the massive police presence at Great Chart - there was a lot of chatter about the amount of resource, police mobile indecent cabins being wheeled in implying some sort of massive investigation. Hindsight suggests that while it was a large and complex area, LE needed a lot of boots in the ground, plus Covid restrictions probably mean they doubled up on vehicles/offices or something to ensure a Covid safe working environment.