That sounds really nasty! Best wishes Matty to your GF for a speedy and complete recovery. But don't get too worried, they can do marvellous things with spinals these days!
I used to know an old guy who broke his neck not once but
three times, and each time made a full recovery and resumed a fit and active life till he was in his 70s. He was a farmer and all the injuries were farming-related: one of them was from being charged by an angry bull

. And all this was long before the days of modern neurosurgery...
You talk of the motorist "trying to get through the gap in traffic". Was your GF filtering past a stationary line, perchance? Not trying to shift the blame, of course, the motorist was still at fault, but still, we all like to learn...