My Life as a White Trash Zombie by Diana Rowland.
Here is the description from Amazon:
Teenage delinquent Angel Crawford lives with her redneck father in the swamps of southern Louisiana. She's a high school dropout, addicted to drugs and alcohol, and has a police record a mile long. But when she's made into a zombie after a car crash, her addictions disappear, except for her all-consuming need to stay "alive".
--This book was a lot of fun. Recommended.