I think she's a quasi-twilek. Her dad probably was human but got drunk and made out with a Twilek dancer girl. The result : Kreia.
:ph34r:
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That must happen a lot. We should see more twilek/human crossbreeds in the star wars universe.
She got those ding dongs hanging from the sides of her head, and she looks like she wear's a twilek headress in those brief instances when her hood is slightly down.