 In the episode "SWAK", after Todd was found to be uninfected, she continued to stay with DiNozzo, lying to him about her condition even though she knew that the risk of infection was still imminent.As he was apparently about to die, Todd was devastated and started crying; DiNozzo eventually survived, much to her relief.Standing with Gibbs and Todd when she was killed, DiNozzo was especially shocked and her death would have a serious impact on him, which along with other events made him "grow up" during the following seasons.