I don't know why you wouldn't indicate when performing any maneuver. A lot of drivers appear to have been told the little flashing light indicates that the force field has been switched on.
If the damage is to the side of your girlfriends car I fail to see what the other drivers excuse for the damage could be? The photo's and her statement and diagrams should tell the story.
That does not guarantee that the insurance companies will not get together and do a deal. " Your Client...