The Question and Answer section for The Glass Castle is a great resource to ask questions, find answers, and discuss the novel.
Do you mean when she got burned cooking hot dogs?
That would be of being burned while cooking hot dogs at the age of three.
Jeanette Walls wanted to chronicle her childhood. I have read, in interviews, that she wanted people to look back on their own lives and discover that they too have toughness and resiliency just as she did.