Her name is Brunette Brilliance Barbie. And no, I didn't make that up.
That's her real name. Part of a special Barbie series a few years back.

From an eBay description:

"Brunette Brilliance Barbie is the second doll in The Red Carpet Collection
from famous fashion designer Bob Mackie. This doll is wearing an extravagant
black velvet gown embroidered in silver with pink, purple, and silver beading.
A fuchsia overskirt and stand-up notched collar edged in silver beads and
silver and black embroidery complete her magnificent ensemble.
Rhinestones earrings dangle perfectly to accent her short black hair
against her ultra pale skin tone color."

Dianne's collection includes a Bob Mackie signature on an original sketch for Mattel.