I am sure I read something that she had reflective gear - sadly it was a reporter finding reflective gear at the seen of the crime.

I know the articles are reporting that she hit the girl somewhere around 5:30, and that she called police from her home before 6:30 - so she did report it in the first hour. The articles are saying that speed and alcohol don't seem to be an issue (I don't know if that's an answer that the police give stock no matter what happens). The police were still at the scene that was 4 miles away when she called a 6:30 - so it probably would have taken 5 minutes for one to get over there and give her a breathalyzer. If she was just barely over the limit of drinking, an hour might have given her time to get under the limit for drunk driving. But really drunk, an hour wasn't going to do anything. I'd assume she wouldn't sober up that much if she was high.