Answer:
She does all the house work
although she was disliked by her stepmother and step-sisters and she stay strong and waited until it was her time to shine
I feel that the missing word is most likely "lens" - check if it's among your options.
When something is compared to a lens through which the word is seen, it means that the world is seen through a certain perspective, that it's using a certain interpretation: here that of literary theory.
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In Mattie's mind, Blanchard's balloon—“a yellow silk bubble escaping the earth”—symbolizes freedom, particularly an escape from her home, where she feels as if she's trapped and treated like a child.