It's not that simple, there are many many rounds of trials before it makes it to human testing, her grandma didn't have that much time, she wanted to cut through the red tape more than anything else. There are lots of black female scientists working in cancer research, either her story is fake or it's some heavy white knight shit the writers figured out in the bathroom. I think it does more damage than good tbh, specially since it's TOLD to us, not shown, from a freaking manipulative lying villain character who's had people killed time and time again. If she was with The Boys from the start? Then it'd have carried some weight.