The internet doesn't usually forget and you know black people don't! No, she doesn't deserve death threats for her behavior (which is always an over-reach), but this is a problem of her own making, because she can't keep her mouth shut.
I have little sympathy for people who cry after causing a problem that could have easily been avoided by exercising self control. I hope she learns to at least keep her thinly veiled racism to herself in the future.