The cocaine from the first DUI was not actually found on Lindsay but rather in the car from which she had already fled. Although she's still culpable, that will probably be dropped as well.
Second arrest that leaves DUI and cocaine possession.
The hit and run will probably be dropped because it was a one vehicle accident and the only person "injured" was Lindsay. So, now we are down to just DUI on the first arrest. If you want to get all crazy you can say that Lindsay could have had drinks before she got tested by the cops because she was so nervous. She could claim she wasn't drinking at the time she was driving but had them in between the accident and when her blood was drawn. Of course it would be a crap argument but she could still hint at it.