She becomes Mayhem, a vigilante in the comics. If I recall correctly, it's been a long time since I read them, she's helps C&D more than hinders.
In the comics it's Dagger that resurrects her. I guess they, the TV people, want to make that Dark Force stuff more important.
In that last episode I thought maybe Dagger would learn to use her light power to drive the fear from the "terrors", trying it out first with Mina. Oh well. Her light also heals, but I guess they're dragging that reveal out a little longer.