Jake Winston 
Age of the Undead 
Kill or Be Killed

Valerie is vulnerable but tough. With her handgun, her courage, and her wits, she survives the beginning of the zombie apocalypse during the mayhem in downtown Phoenix and escapes, only to join a motorcycle gang that she doesn't particulary trust.

After a horde of zombies and a series of events, she decides, for a while, to vent on her own, until she joins another group of bikers that seems a bit more trustworthy. Infected wildlife, difficult decisions, and teaming up with the right kind of people all become part of her journey until they reach a jail full of inmates that have been locked up and beg them to release them. Once again, they are faced with a dilemma that will require them to follow their instincts.

This is book 1 in a shortread series of 6 dystopian zombie books.