Only Till This Is Over

this is in an apocalyptic setting . mavis is the main character shes a foster kid trying to survive so she can get back to her sister elly. sheila is the protagonist and is just trying to get by to prove to her dad that she can make it on her own even in the apocalypse. after mavis begrudgingly saves sheila from a zombie horde they agree to stick together untill mavis can get back to her sister (how was taken to a safer town). will they survive? will more people join there party? maybe a friendship will come to life or even a budding romance, read to find out.