Bloody Disgusting says
It looks as if Sony Screen Gems is hinting at the mother-daughter relationship in the latest clip from Underworld: Awakening. The footage shown below shares a conversations between Selene (Kate Beckinsale) and Eve (India Eisley), a young girl who plays the vampire/Lycan hybrid. This young girl is said to be Selene's daughter and is primed to take over the franchise.
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Nekki has announced that the forthcoming gun fu game, SPINE, will receive a movie adaptation to expand the franchise.
I believe it is her daughter. I read that in an earlier story that she had a daughter hybrid and was put to sleep for all those years. When they first started filming that was the storyline they were telling.