The Matriarch does truly enjoy brutalizing her opponents. It's fairly rare that her victims are able to walk out of the ring on their own, and usually just lay motionless on the canvas until medical comes to help. Quite often, her victims are left with a broken spine- unable to walk until they receive magical attention.
Today, Zaerine will be no exception. This much is clear as the match continued on, with the blood elf never able to really recover from the punishment she received in the first few submission holds. Tapping out our submitting doesn't matter to the Matriarch. Getting knocked out isn't even relevant. She's done when she's done.