It was 5:23 am on Sunday. She could have either come off a long shift or woken up early to start one (not everyone has the luxury of a 9 to 5 weekday job) She could have just been tired and dosed off or zoned out. Alcohol or cell phones don't have to be involved. Especially as, who do you text message or call at 5:23 am? There's also the chance that the cyclist was in the wrong, didn't stop for a light or stop whatever (I haven't checked if any other details have come out)

The whole not stopping thing is bizarre - but I guess there is a possibility that she knew she hit a cyclist and just plain freaked out and went home as soon as possible especially since she was so close.