Ever thought of changing Girlfriend
Have to agree with Dagnut, that hour of the morning and that much damage on a Roundabout, the fact she left the car does look very strange, looks like either she was drunk, or someone was driving it that shouldnt be, or you were drunk and smacked it and ran back home to get the sober Girlfriend to say she was driving it. Im not saying thats what happened, but its a very common thing thats done, and the cops are well aware of it
If the insurance company price the parts, it will be a write off, they will see a payout of 6k, and sell the wreck for say 3-4k, leaving them suffering say 3k max which they will hide into your premiums.
You could always go 2nd hand parts route, but id say again you are finished its still going to cost you a good bit.
For talk sake if you were lucky and fixed it for 2k, this day with their prices you have to be realistic and way up the idea of breaking the car and instead of spending 2k fixing it, put it to the breaking money and buy a new car.