She wasn't made to go, didn't she say she didn't want to hang around and squabble over who had control of the company? I assume Vickers is there for more allegory. Weyland's rejection of his flesh and blood for his synethic "son" David. His refusal to die and let his offspring flourish (which is crap, IMHO, because if you can't be your own person without your parent dying, then that's on you, not them.)
I was wondering about the big the red space suits that were in the background of at least one scene.