There does seem to be a lot of circumstantial events surrounding this case to counter a possibility that she put the car into the drink herself. The fact that she hasn't appeared since, would also seem to preclude her staging her own disappearance.Would she have to go past Cottesloe Beach to get home though? Presuming she was actually on her way home and not meeting someone at Cottesloe. Then taken either a sharp left or right turn across another lane to enter the winding service road down to the beach. It doesn't seem that might be done accidentally.
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