the glass castle
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Again, our copies have different page numbers. I will try to find this passage and answer your question as soon as possible.
It shows the fact that what once was a good idea is not now. After being let down many times, Walls has finally gave up on the idea. Rex tried to convince Walls to stay by showing her new plans on the Glass Castle but she knew that, staying behind and have new hopes, she'll just be put down again. All the faith she had in the Glass Castle and her father is now all gone. Walls now just wants to leave Welch and build her new life outside of false hopes.