You could alway have it be part of the story that her family used to live someplace else and moved to Seattle soon after she was born. Moving to Seattle and learning Aurora's awful local association would certainly give the family reason to call her Rory as much as possible.
I think Aurora, nn Rory, is a good fit for the family. It has the same feel, and it seems like a good bridge between the more unusual eldest child's name and the more mainstream names under consideration for the younger siblings. I can picture parents who would name their other children Gratian, Theodore/Lucas, and Penelope choosing Aurora as well.
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