Conflict in Imperfect Spiral

In the book Imperfect Spiral, Daniella a teenage girl who is baby sitting a five year old Humphrey. She taught him how to throw a football and catch one. Daniella threw the ball farther and it landed on the street. Humphrey went to go get the ball,he wasn't paying attention. There was a car coming and it hit Humphrey. Daniella  ran to him and she crys. Few months later she goes visit he's family. She kept saying it was her fault and she was blaming her self. " I'm so sorry, you must be in pain, how awful for you." She's been writing her a lot of letters and she hasn't answered none. That's why she thinks it's her fault. But later when she goes visit they say it isn't her fault that it was that kid because he was so young and he wasn't paying attention.