Why didn't she wire the funds in the first place?
I'll use a bank cheque or a money order as a kind of escrow: if buying a car 'with cash' (so to speak), I'll take out a bank cheque/money order in the amount. Then I give the cheque to the seller when he's signed the transfer of deed.
He knows the bank is good for the cheque, and I haven't had to carry around cash that I can be mugged for. And if the seller is fraudulent, there's a paper trail which doesn't exist if I pay cash.
(Yes, if he fails to sell me the car and steals the cheque, well, it's made out to his name so the bank is legally obliged to pay him. But that's where I get the Federal Police' fraud department in on things - and banks tend to be cooperative with them.