The Question and Answer section for The Fault in Our Stars is a great resource to ask questions, find answers, and discuss the novel.
The elevator at the group is used for people who don't have a lot of time left. She wants to be strong enough to not have to use it, even if her lungs can't really handle stairs. She doesn't want to be viewed as weak by others.
Sadly, Hazel still has cancer at the end of the book and expects to die from it.
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