No, she's not. She's a harbinger of doom for the Democrats. They can either embrace her, which makes them look even more radical than they already are, or they can shun her, which makes them look racist and un-progressive.
She's an extremist, and forces them to play their hand, but she herself has no power at all.
That's what makes her dangerous. Her comments would have torpedoed any Republican, but she gets a pass.