They likely just wanted a certain type of character and the actress is just that, an actress acting that cg character. The intent was clearly not scanning and using her likeness 1:1, it's not intended to be the same approach as death stranding. What a cumbersome discussion.
The face looks amazingly real. I think that's the best face I've seen in UDK yet. I've not played mass effect 3 though. It almost makes the rest look CG, as if it's footage/CG composite. Awesome work man.