Adriana was the girlfriend of sex trafficker Cesar Santos.
Cesar Santos' Death
Because of a larger scheme by Lex Luthor to manipulate both Batman and Superman, he had Anatoli Knyazev giving the order to inmates inside to murder Cesar Santos while he's incarcerated in Metropolis.
As a reporter for the Daily Planet, Superman, as Clark Kent, travels to Gotham City, New Jersey to demand answers from the Gotham City Police Department about the death. Clark is stonewalled by the police officers, but one nonverbally directs his attention to Adriana Santos, who is at the station with her son to pick up possessions of the late Cesar. Outside the station, Clark addresses her as "Mrs. Santos" and Adriana corrects him saying she wasn't married to Cesar, but they did have a son together, who will now grow up without a father. She says it's not right that a vigilante gets to decide who lives and who dies, and the police just go along with it. Clark states he wants to help, but Adriana states his "pen" won't help and only "fists" can stop the seemingly-out-of-control Batman as she walks away upset. Agreeing with her, Clark feels compelled to take more direct action to stop the activities of Batman.