Lucille

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When Huxley was reading Dahlia's Diary, we could read about Lucille pushing Dahlia off the roof, when they sat there together to watch stars. The owner didn't believe Dahlia. From that moment on Lucille got avoided by Dahlia.

The next words we can see are "She deserved it. They wouldn't have done that if she didn't." which implies something bad happening to Lucille.