Possible motivations for Vickers?

So I've been thinking about the Vickers character, partly because Theron is a goddess, and I came up with two possible ideas as to what her role might be. The first is that she is actually Weyland's daughter. This might explain a scene revealed in the trailer of her being not too kind to David, because in the 12 min footage revealed in Paris there is a scene where Weyland talks about David being his son. Maybe she has resentment towards David because of this? Second idea is that maybe she is actually a corporate spy from the yutani corporation? Any thoughts?