Here is an account from local news source.
From this story we know the driver of the Mazda had been drinking but don't know if she was over the legal limit. Even if below the legal limit there is going to be some impairment of reaction time. Also worth noting is the accident occurred at 2:00 a.m. If the driver of the Mazda had been awake since 7:00 a.m. she would have been awake for 19 hours. There is plenty of research showing sleep deprivation can reduce reaction time as significantly as alcohol.
From the article the Lamborghini hit the center median which would be south shoulder but Smith and Petara were standing on the north shoulder when she was hit. Sounds like the car ended up back toward the north shoulder. The only thing that makes sense to me is the car came to rest mostly in the right lane facing west. The driver of the Mazda to avoid hitting the Lamborghini swerved right attempting to go around it on the north shoulder. So why wouldn't the Mazda driver swerve left instead? Maybe there was already a car on her left or maybe she was behind another car that swerved left and slammed on the breaks. It's all speculation, we just don't know.