[wtfsvi]

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How can it be a mental problem, when Jessica said things to their dad Niki couldn't have known about?

[/ QUOTE ] She did? Niki was there when their dad abused Jessica. What couldn't she know?

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Jessica is living inside of Niki, sometimes taking control, and being very powerful while doing so.

[/ QUOTE ] It is possible that she has both mental issues and a super power, but only one of the personalities (Jessica) have mastered the power (super strength). This came to mind when Jessica said "I thought she had learned to defend herself, but...".