She frequently had a sad or angry expression on her face. She was Latina, as was Maria LaGuerta.
While she was married to Angel Batista, they had a daughter together named Auri. At an unknown point, Angel cheated on her and confessed immediately afterwards out of guilt. She was heartbroken and forced him to move out, although Angel hoped that they would reunite.
The way that Angel talked to his work colleagues about his wife let them think that they were still together. He bought her an anniversary gift in the hopes that she would forgive him. It didn't work, but she did allow him to see Auri before he left, demonstrating that she was not vindictive, just hurt.
Angel got a raise at work and went out with Dexter to celebrate, but he had too much to drink. Dexter took Angel home and dropped him on the couch. Nina came into the room, asking Dexter what they were doing in her house, and he explained about the raise. Nina informed Dexter that Angel did not live there anymore. Not sure what to do with Angel, Dexter took him back to his own apartment to sleep it off.
While in a parking garage, Angel was stabbed by The Ice Truck Killer. Nina went to the hospital to support and comfort him, and Angel hoped that she was going to take him home. Nina stated that she did forgive him, but their marriage was over. She reminded Angel that, while they were married, they lived a life of unhappiness. Nina and Angel subsequently divorced and Nina retained custody of Auri, she but let Angel see her from time to time.