Gaia went missing in an area with lots of open spaces, not in the middle of a built-up area, so I would really have thought that Libby would have been found by now if this was a case of hypothermia?
So is it possible that Libby didn't go down Beresford Ave as was said before, and that a car did pick her up from the bench by the bus stop? I would think that street with the bus stop would be a better place to encounter someone in a car than Beresford, and if there aren't security cameras on houses down Beresford and the only camera footage for the bus stop is from dashcams, then it might be a case of the bus seeing Libby at 11.40, and then the next time a car with a cam that's contacted police has gone by is 12.09 and she's not seen on that footage, then LE would have the conundrum of whether she walked off or was she picked up by a car?