Reborn: My Bestie's Survival

Summer Lynn is reborn before a zombie outbreak. Sarah Sullivan died saving her. Summer finds Sarah. They adopt Guardian. After outbreak, they survive, fending off Zane Shaw. Guardian dies protecting them; Summer and Sarah throw Zane to zombies. They rescue Hope, immune to virus, protected by her zombie father. Hope's blood is key to a vaccine. Vaccine developed, zombies eradicated. Summer and Sarah adopt Hope, rebuild orphanage, forming a family.