What is the most difficult choice Liesel had to make in the story?

Wow, there are so many difficult choices Liesel has to make. I think her courage in the open was the most dangerous. In the chapter "Book of Fire", Liesel goes up to the smouldering heap of the book burning as workers cart away ashes. Liesel sees three books that remain mostly intact and she steals a blue book called The Shoulder Shrug. She puts it under her shirt even though it is still hot. The workmen or soldier's don't seem to notice but every time she steals a condemned book, she risks her life.