English homework help please?

for english i need to write a short story, with a twist. it needs to lead to something different, and make the reader think im talking about something different than i am. the story has to be about a child loosing their innocence and ive decided to write about a girl that has lukemia but because shes ill, she likes to pretend shes laying in a field because she used to go there all the time when she was younger. ive described the field but i need to change the atmosphere dramatically to the hospital scene, and i need some help to do that? any suggestions or is the whole story bad?