Reading a news article, Daily Mail, I know, she may not be at fault. He was kicked out of an Uber, so probalby drunk. His dad said the road where he was dropped off was dangerous. Not well lit, to boot.
Either way, she panicked, people do that. She may have thought she'd be in trouble when she may not have. Cultural thing? Worried about the police and the legal system as many do and rightly so in a lot of instances.