Just thought I'd share some findings/thoughts regarding the cell tower ping information.
It was said her phone pinged a tower near Buninyong Golf Club, which seems to be a strange location as there is no cell tower there (why not just say 'a tower near Buninyong'?). There is however a cell tower named 'Buninyong Golf Course'.
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I think we can assume this is the cell tower police would be referring to. This tower also only serves Optus services, although I'm not sure if other carriers will register pings (perhaps only when there is no service on the main carrier?).
In any case, this tower is on the outskirts of the Ballarat area and would likely service an area 10km+ south/south-west of Buninyong. There are however nearby towers in other directions. So for the last ping to happen at that tower, it would likely need to be have been very close to the golf course OR much further south, along Colac-Ballarat Rd. Colac-Ballarat Rd also descends 200m+ which would allow the signal to travel further. It's also important to note that there is also a tower on the nearby and relatively high Mt Buninyong, which may indicate the ping was closer rather than further to the 'Buninyong Golf Course' tower.
This is the area south along 'Colac-Ballarat Rd'. I've marked the golf course tower in red vs competing nearby towers in blue.
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source:
Radio Frequency National Site Archive