Can she still be charged with a DUI after the fact with no BAC, no sobriety test and no witnesses?

My friend was driving home one night on a country road, swerved as to not hit a deer, and rolled her vehicle. She had not been drinking. The police were not called, and there were no witnesses. She was going to get her friend to tow her car in the morning but it was already gone. She was notified by neighbors that cops had seen the car and had it towed. When she went to the tow place, she was told she can't pick it you until it's released by the county police. Now she was not drinking but, there was a 12 pack of beer in her car that had scattered, exploded, and went everywhere.