The whole point of the OP is misguided, imo. The actress in question was NOT there to address the issue of what it’s like to be a black youth struggling with extreme poverty. She was there to talk about “Race, Childhood, and Inequality in the Political Realm.”
Apart from her SES status, I think it’s offensive for the OP to decide that this young woman is not “black enough” to weigh in on these issues.