Car accident liability in Missouri
The following accident happened in Ballwin, Missouri. My fiancée was properly parked in a grocery store parking lot. Her car engine was turned off and she was about to exit her car, with her driver's door just barely open, when a van tried to pass through the parking space on her left. It caught the door, dragged it open and released it only when it was past my fiancée's car. The van drove so fast that it only stopped in the parking spot on the other side. The driver of the van does not admit that she caused the accident and we are convinced that my fiancée is not at fault.
Questions:
1. If there is no fault admitted, what are my fiancée's options and will most likely happen?
2. What is the responsibility of my fiancée's insurance? They claim that in the absence of witnesses the liability is 50% on each side.
3. In the absence of witnesses, does the material evidence count? (The way the door is damaged is indicative of what happened.)
4. Whose responsibility is to decipher the state's accident laws and protect my fiancée's interests? (We feel that, since the accident was not her fault, she shouldn't be responsible for the damages.)