What is going on here?!

15 year old Rianna lives alone with her best friend Zoey. When she was four she met the 5 people you know and love,One Direction themself. 11 years later at the beginning of the second zombie apocalypse they show up on her safe room doorstep, asking for shelter, food, and protection once again. Will she help them, or will she leave them in a world full of zombies to become one of the walking dead?