Hit and run...really

We were in a mild accident around Thanksgiving. We'd merged and were ahead of the truck behind us for say, 10-15 car lenghts time, and she (the truck) bumps us and the van door pops open and we get pushed toward this really wide shoulder...the Camas semi-highway, still in town 35-40mph, but preparing to get onto the freeway after a few lights. We try to get her to stop, but she won't. We keep her in back of us for a few minutes, get her plate number, then let her pass us. She zipps ahead, then takes a quick right at the next red light. We follow her and the semi-chase is on. She makes a loop, us still following her and she finally gets onto the highway. We call the police and make a report of hit and run, all the time following her. After about 5 minutes they tell us to stop following her and pull off to the shoulder. So we do. They don't find her, but take pictures of the nice dent and take Tim's statement. The officer said he was giving her a $500 ticket for negligent driving, and backing us about it not being a merging issue. We find out she does have an insurance.They're claiming it was a merging issue. I don't know her excuse for not stopping. We got a check today from our insurance, not the full amount. They're claiming it wasn't Tim's fault, but advised us that we will probably have to pay our $250 deductible because it's her belated word against ours. Go figure.