Tbh I think Nia is a white cock girl. You can definitely see the difference in her performances when she's fucking white guys. She clearly loves it more. I think that was why it took her so long to do scenes with black guys....she just doesn't seem interested in them, which I think accounts for her lack of enthusiasm.
She has lost the enthusiasm she once had, when she used to cum over and over again, the excitement has been replaced by acting. The lack of authenticity just kills it for those of us looking for real life insights, not produced and curated porn.