Accident in a parking lot

Hello everyone, have a question, maybe someone can help me here. Today my girlfriend had an accident, this happened at one per market parking lot in the Giessen (maybe someone knows the place). I was unfortunately not on site and can not describe as exactly as it happened, could only later inspect my broken car. The man in the other car claimed that she had taken his way, but on the parking lot entrance there is no sign where stands, that The man went into the end of the front passenger door. So the damage goes over both side doors, up to the bumper, which fell off. The police, who arrived a short time later, said that my girlfriend is actually right, but the insurance company will check it again and name the culprit. I’m afraid of a partial debt. Did someone already have experience with something like this? And what is your opinion about how it might end? nnt? In my opinion, the man did it extra to make some money with it, he could not have had more than 20 kmh, and you can always brake. Especially the whole car was already on the “cross” and it is not a small car, so hard to overlook (volvo v50), it was also relatively bright, it happened at 16 o’clock. I will be happy about every answer. Because I don’t know what to do now, never had an accident.