Zombie Breakdown

Y/n was having a normal day at school (any grade at or above 6th) when the school suddenly goes into a modified lockdown. When a full lockdown is in place, and the school's last defenses fail, can Y/n escape the school, survive with her friends, and see her family again?

I will be using female pronouns, but if you aren't a girl, just mentally switch those out for your pronouns. I will be basing the characters off of real characters in my life, but I won't be using their actual names.