She’s doing the “black voice” that middle class brown kids who grew up in the suburbs learned from movies and TV. Dave Chapelle does the “black voice” he learned on TV too (he grew up in a white suburb). Obama also does this voice he learned on TV. It’s super common. Honestly at this point I’m not even sure if that “black voice” was ever a real thing, or if Jewish People in Hollywood made it up and programmed it into them.