What I meant was, and this is how it came off to me, that Sheryl Nome is a total fabrication, she in reality was just another homeless girl that Grace picked up to experiment on. That was the impression I get from that scene. Maybe I am reading too much into it, I don't know. And I don't recall that issue with the blood, either, other than the fact they had clearly done something to it.
Had she been Mao's granddaughter, I think this would have played out entirely differently. Somebody would have said something about it by now.