The Question and Answer section for The Lottery and Other Stories is a great resource to ask questions, find answers, and discuss the novel.
This is the time for the anual "lottery". The town does this every year although few actually know why.
The lottery is told in the first person. The narrator relates the events as they happen, thus, we only see them as they unfold.
Tess is questioning or protesting the lottery itself. She is questioning tradition, and also protesting the action that takes someone's life every year. In this case.... it is her life.