Put this in a spoiler tag just in case my guess is correct, don't want to risk spoiling the story for anyone else.
Spoiler:
Quote:
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What’s more, it seems like her alter ego’s reckless, extravagant lifestyle is the one Alice should have been leading all along. As the little white lies begin to stack up, how far will Alice go to find the truth?
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That just screams that the twist is based on her having dissociative identity, if so, shame on them for including the twist in the overview blurb. Hopefully that's not the twist though, would be silly to spoil a book for your readers in such a way.