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No, she never did, but possibly shes dead in the alternate reality cause Jacob never healed her.

We don't know what happened to Juliet's sister. Ben is a master manipuator and Juliet was getting out of hand. Ben just happens to give her files showing her sister has cancer and then promises to get Jacob to heal her if she keeps working for Ben. But we know this is a lie now as Ben has never even met Jacob.

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