I hope she has taken the full details of the truck and the also the drivers details.
She should get 3 quotes to repair her car and send them to him and request payment for the repairs.
If he refuses then she will have to sue him in court.
The following link is the process in the small claims division of the local court.
Because the car cannot be repaired then she can only claim the cost or buying a replacement car and has to look at what it would cost to replace and sue for that.
She will need a letter from the smash repairer to confirm that it is a written off.
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