All Our Tomorrows — Peter Cawdron

Hazel is alone in a crowd. No one understands her, not even her father. The only people that ever really understood her were Steve, David and Jane. But they're dead. If they're not dead, they're dying stranded outside the compound. Hazel can't accept the bitter reality of life in the zombie apocalypse, she can't accept that her friends are probably dead. She has to find them. ALL OUR TOMORROWS is the action packed sequel to WHAT WE LEFT BEHIND