It might refer to a specific piece of media, a video, or a story where a character's mother undergoes a "new" phase associated with the color black.
In this context, "going black" means uncovering the truth. It is a "new" version of the mother—the one she was before she had to hide. It is a powerful, painful, and often beautiful reunion with a heritage that was stolen by racism. watching my mom go black new
: Transitioning from soft pinks to deep berry or bold dark tones. It might refer to a specific piece of