It's funny how we can all look at a situation and come to completely different conclusions.
My take on it is Ngosi went into this situation with the intention of provoking a situation she could exploit for media attention. Looking at her Twitter account, it is clear she has an already established view of the RF, with tweets that express admiration for Megan and accuse King Charles and Camilla of domestic violence against Megan in 2021.
Looking at the transcript of the conversation, Ngosi seemed to be deliberately vague about her ancestry, claiming she didn't know citing lack of records. This is nonsense given that she has a BA in African Studies from SOAS and has given herself the name Fulani, one of the 3 main tribes in Africa.
She seemed to be deliberately forcing Lady Susan to ask further questions regarding her heritage so she could then frame the interaction as an " interrogation" when all I see is an elderly lady who was genuinely interested in this woman's heritage.
It all smacks of a set up to me.