In the end, when the female detective and the father were negotiating in the cabin, they talked about the words that the father would sacrifice for the little girl. I guess she should have the ability to predict the future. If she is really an Inhuman, it would echo her motives for defending Inhumans on TV before, but maybe her ability is not easy to be discovered and she is an agent, so she has been hidden from normal people. The final explanation for why the female detective died should be that her ability can only predict but not change the future.
The above is purely personal opinion. . .
This sentence seems to be a hint to the father of his identity.
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