keep her life

Cas was a normal girl, she had friends, rode her bike to the library,and lived on the computer .that is, until the end of the world. now, instead of bieing 13 with the biggest problem in her life having to go to middle school the next year, she finds herself a year later scavenging through trash for food, helping feed the whole school she lives in, taking care of a mentally unstable 4 year old, and keeping herself from going insane with the constant moans of the dead ringing eternally. Will she be able to keep herself afloat in the zombie apocalypse?