Nara Jurascik was a member of the team sent over from Shadow Earth to prepare Deathlands for colonization. Unbeknownst to the rest of her team, however, she was a double agent; she was tasked with gaining sole control of any natives brought back (in this case, Ryan) and using their knowledge for her boss' use. She double-crossed her boss, though, and took Ryan back to Deathlands, closing the gate behind them (Shadow World).
The companions encountered the Shadow Worlders again when another group came through the portal and started a mining camp at Slake City. She was captured, along with Colonel Gabhart, and put to work in the mines; she was dragged off by stickies and killed, though she was dying of rad sickness anyway (Breakthrough).