The whole situation was handled terribly by Ms. Fulani and Lady Susan. There was a lack of tact and etiquette by both. Lady Susan should not have touched the other woman's hair to read her nametag and Ms. Fulani should have politely stated that Lady Susan could have asked her name and she would have told her and rather than move her hair. As I said if Lady Susan kept up the questions of where she "was from" then Ms. Fulani could have tried changing the subject and if that didn't work, then politely excuse herself from the conversation. Ms. Fulani should have had a quiet conversation with one of the Palace staff in attendance explained the situation. I'm sure we've all had sticky conversations, we all try to handle it the best we can, both women didn't handle it well.
In my old neighborhood and now my new one, I have neighbors from Asia, Africa and Mexico and I love to learn about the countries, cultures as well as the person's life. I've never had anyone offended, but one has to be attuned to the other person's answers and posture, if someone doesn't want to volunteer info then drop it.

I'm curious if Lady Susan has done this before with women/men of color in all her years of service? In other words, was this one off or has this been ongoing and no one has brought such action to light until now? We don't know or will likely know.