who is lisa in this story

Lisa Nelson is a ten-year-old girl who is left to fend for herself and care for her brother when her parents, and all adults, are killed off by a virus. Lisa is intelligent, and she comes to believe that intelligence and ideas will help her survive. Her greatest asset is her ability to think through problems and come up with ideas for solutions. When supplies start running out in local houses, Lisa thinks of going to nearby farms to find supplies. She also teaches herself to drive the family car so that she can get around her town.