I was under the impression that LE said an interior motion-activated camera caught the movement of her car as it drove up and parked under the porte cochere, though I doubt I could find it again in these threads. I agree with SteveS that LE stated none of the outdoor cameras had been working that morning. (Also stated was, prior to that morning they'd been working "intermittently.")
So looking at the indoor NG diagram which showed interior cameras near the SW porte cochere entrance, I simply deduced (rightly or wrongly) that the camera in this diagram on the hall wall pointed toward the glass SW doors was the one that 'activated' (with its timeclock also recording the 4:16am time) when MB pulled up under that awning to unload. It's the camera in the bottom right of this diagram ("where Missy died") with two arrows pointing at it:
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(NG plucked this map from WS Arkansasmimi... just sayin') IMO